Transit
People mover vs rail to Dulles saves more than money
A proposal to use a people mover instead of Metro for the final 1.5 miles of transit to Dulles Airport drew criticism here and from airports authority board members. But this could actually save traveling time as well as money, and is an effective practice in many other cities.
On Tuesday, Robert Brown, a member of the Metropolitan Washington Airports Authority (MWAA), suggested rethinking his agency's planned Metro rail extension out to Dulles Airport.
Instead of bringing this $2.8 billion rail link directly to the airport, Brown noted that replacing the final 1.5-mile connection with a people mover would save $70 million thanks to a more limited right-of-way and the construction of one fewer Metro station.
Perhaps unsurprisingly, the idea was perceived as heresy, both by Dan Malouff and MWAA board members. Mame Reiley, one board member, said, "I just don't think that's what we labored for... it is not rail to Dulles."
Board members raised concerns that the federal government might delay the program because the board was "starting over." And indeed the proposal appears to have been dismissed by the authority board as unacceptable.
But such a change could be a reasonable money-saver and may actually improve transit service for both commuters and air travelers. The question is immediately relevant to the Dulles Rail extension, but also equally valid to many cities, as the issue of extending rail networks out towards airports is frequently of concern for transportation planners in major metropolitan areas.
The question of how to reach Dulles by rail has been fraught with controversy since project development began. Originally, the concept was to connect the Metro line to an underground station about 550 feet from the main terminal, but after the project's price tag had exploded past $3 billion, cost-savings became necessary.
The MWAA, which runs Dulles Airport in addition to the Metro extension, eventually agreed in July 2011 to move the stop about 600 feet farther away and to elevate it above the ground. Riders wanting to get off at Dulles will have to make the more than thousand-foot walk from the station to check-in.
Brown's likely stillborn proposal to replace the direct rail link with a people mover reflects the fact that riders are likely to see this connection as inconvenient, especially compared with that at Reagan National Airport, where customers only have to walk about 150 feet between Metro platform and the terminal entrance.
Brown suggested rerouting the Metro line away from the airport (the existing plan is shown in orange below and would be about 4 miles from Route 28 to Route 606), so that it runs directly along the Dulles Greenway (in blue, about 2.5 miles from Route 28 to Route 606). A people mover (also in blue, about 1.5 miles) would connect the Route 28 station to the front of the terminal.
Though customers would have to transfer, they would now get a more direct journey, since it would be far easier to fit in front of the terminal the tracks and station for the people mover than it would have been for the Metro line (and in fact this explains why that latter possibility was never brought up).
This would save a total of $70 million, according to planner estimates, because it would replace about 1.5 miles of very expensive Metro infrastructure (readied for eight-car trains) with much lighter automatic people mover infrastructure, designed for one- or two-car trains.
We know this would save some money. How would this change affect customers?
Riders commuting in to Tyson's Corner, Arlington, or Washington from outer suburban destinations on the end of the rail line west of Dulles would save time: At the 35-mph average speed expected for Silver Line trains,* it will take about 6.9 minutes to get from Route 28 to Route 606 using the current plan. The more direct route proposed by Brown would reduce that journey to 4.3 minutes. That's almost half an hour in saved travel time per week per commuter.
Even better, those using the Silver Line to get to and from the airport might actually save time travelling too.** Though these customers would have to transfer between Dulles Metro and the people mover, if that connection were timed and across the platform (as is quite possible when two automated systems are linked and built at the same time), the time lost would be only two or three minutes.
Meanwhile, once they actually get off at the terminal, the experience of riders taking the people mover would be much superior: Rather than walking 1,150 feet to the terminal, which would take them about 4.8 minutes on average, they would walk something more like 150 feet, which would take them only 0.6 minutes.*** See this back of the envelope comparison:
| Arrive at Rt 28 station | Timed transfer to people mover | Time to Dulles Airport station | Walk to terminal | Total travel time | |
| Existing proposal | 0 min | -- | 2.5 min | 4.8 min (or about 3 min with moving walkway) | 5.5-7.3 min |
| People mover proposal | 0 min | 3 min | 2.5 min | 0.6 min | 6.1 min |
Though the use of the people mover raises questions about operating another rail system, it could be maintained with similar vehicles as those already servicing Dulles on the Aerotrain, which connects checked-in passengers to the terminals.
The Washington region would not be alone if it chose to make its airport rail link stop somewhat short of the terminal itself. In Phoenix, the new light rail system was built in coordination with airport officials, who are currently constructing an automated train between the rail station and the terminals. The San Francisco Bay Area is building an airport connector to the Oakland Airport that will link a BART station some miles away to the terminals.
And Miami's new AirportLink Metro Rail project will not actually stop at the airport, but instead at a new central station with transfers to a people mover.Riders in these regions will not suffer; they may lose a few minutes transferring between trains, but if the connection is short and timed, that pain can be minimized. Avoiding the airport, paradoxically enough, could both save money and improve the situation for riders.
* 35 mph: PlanItMetro projects it will take about 22 minutes to travel the 12.8 miles between Dulles Airport and Tysons 7 Station.
** The only customers would would lose out with this change would be those traveling to and from Dulles from outer-suburban locations.
*** Assuming that people with bags travel at about 4 feet/second, a bit slower than the average walking speed of an elderly person.
Cross-posted at The Transport Politic.
Comments
- Cyclists are special and do have their own rules
- M Street cycle track keeps improving, draws church anger
- Judge denies injunction against closing schools
- O'Malley announces first projects using new gas tax money
- ICC losing bus service in classic bait and switch
- Can Loudoun grow while protecting its rural areas?
- Silver Spring mall could get massive facelift, new name







by Crickey7 on Jan 20, 2012 10:26 am • link • report
Well played, VA. Well played!
by John on Jan 20, 2012 10:28 am • link • report
by MJ on Jan 20, 2012 10:28 am • link • report
It's certainly an idea worth discussing, though I'd offer that while this reasoning and the plan both sound logical and promising, Robert Brown probably isn't thinking about better, he's just thinking about cheaper. Does that mean it couldn't be turned into something worthwhile? Not necessarily, of course.
by Steve D on Jan 20, 2012 10:30 am • link • report
"...any projected $70 million savings based on a people mover system that has not even been studied, compared to a Metro system in later stages of engineering design, will disappear as the new people mover costs go up."
by Steve D on Jan 20, 2012 10:37 am • link • report
by roomd on Jan 20, 2012 10:40 am • link • report
by Ronald on Jan 20, 2012 10:40 am • link • report
Trying to maximize benefits for both locations will likely result in poorer results for both. This suggestion is worthy of serious consideration.
by tmtfairfax on Jan 20, 2012 10:48 am • link • report
1. It replaces a plan that actually exists and has cost estimates, reviews, etc. with a plan that does not exist, has had no research done, no cost estimates (beyond one person saying "this would save $70 million," I haven't seen a document that estimates costs), no nothing.
2. If the people mover is going to be BETTER than the Metro connection, you have to rely on an element that originally was in the Metro plan but was cut due to cost factors. In order for the people mover to be a good idea the station would have to basically be at or directly under the terminal. This is closer than the Metro station was ever planned to be. Why would we assume that building a people mover station at or under the terminal would be more accepted or feasible than a Metro station?
The reason we're immediately dismissing this proposal is that the supposed "cost savings" are tiny. You're looking at saving 2.5% of the cost of phase II by creating an entirely new project from the ground up. Once you consider potential cost overruns in either project, that $70 million is probably gone. And the people mover station is probably in the daily garage just like the Metro, and there's no timed transfer because the agencies can't cooperate, and hey it's only 1.5 miles and the people mover is really expensive so let's just do it with a bus instead for the next 20 years.
by MLD on Jan 20, 2012 10:50 am • link • report
by TeganAnn on Jan 20, 2012 10:50 am • link • report
The idea that it was sold as a rail line to Dulles and then say..."oh never mind" light rail or bus routes are just fine is sickening. It's a scandal and they should all be forced to resign even if this was a stupid and careless trial balloon. Many...very many...advocated for a light rail route from West Falls Church to Dulles. No stops..just a link to Dulles. That would have made financial sense.
But to have the construction underway and then change the plan because these 'loons' still cannot believe their underground stop at Dulles is too expensive...is simply insulting. These are the actions of despots. Off with their heads I say!
by Pelham1861 on Jan 20, 2012 11:02 am • link • report
Also, this is assuming MWAA would be willing to let a peoplemover station exist right in front of the station. That is an assumption.
Biggest difficult for passengers isn't neccearily the distance, but the elevation.
by charlie on Jan 20, 2012 11:03 am • link • report
Another point against is that the I think the people mover (even if it were actually faster) would have this perception of an extra step and that would cause some people to opt to drive instead.
by Steven Yates on Jan 20, 2012 11:05 am • link • report
by Cavan on Jan 20, 2012 11:05 am • link • report
by Frank IBC on Jan 20, 2012 11:08 am • link • report
by reader on Jan 20, 2012 11:11 am • link • report
A more realistic model would be to assume that a people mover would appear every 6 minutes (3 minutes if there are 2 tracks&trains at twice the price). So the connection the added time would be 2.6 min for a perfect connected to 8.6 for a perfect miss. Upkeep of a such a system which completely distinct parts doesn't seem to be considered here.
Also, as someone who used to live in the Bay Area, the current BART to OAK bus connections were awful, but were a byproduct of how they built BART (with a stop at the sports stadiums instead of the airport. That they're trying to fix that mess now with a people mover is an improvement, but now how one would want to design a system from scratch.
by Dan H on Jan 20, 2012 11:26 am • link • report
by Ser Amantio di Nicolao on Jan 20, 2012 11:26 am • link • report
That point above by MLD deserves re-posting. It's the main reason I am also against this idea. Stick with the plan people. Changing the ship mid-course will only delay the project for years and put the funding sources at further risk. Sure, saving $70mil up front sounds good, but the grand scheme of things it's negligible and there are millions in hidden/unforseen costs that have not been planned out with the alternative plan yet.
I thought the idea was to have some of the silver trains be "express" to Dulles and have them skip many of the smaller stops after EFC? Wouldn't that solve the problem and keep the proposal as is?
Isn't that the whole point?
by LuvDusty on Jan 20, 2012 11:27 am • link • report
This whole "people mover" idea is copped from the AirRail system at JFK and the new system being buit at MIA - both airports with multiple terminal locations, and where it's impractical to send the local transit line due to said multi-terminal layout.
But Dulles is a SINGLE TERMINAL AIRPORT: all check-ins and security screenings happen at the Saarinen terminal, a single point of entry and exit, the embodiment of simplicity. Adding a "what-if" people mover to the Silver Line adds needless complexity and additional failure points to this transit system. It is, as John states, a "Trojan horse" situation: "Metro to Dulles" that bypasses Dulles.
The adage holds true: the simplest solution is often the best. And in this case, having a Dulles Metrorail station is the simplest - and best - solution.
by Rudi on Jan 20, 2012 11:28 am • link • report
The people mover could be a nifty idea though. Too bad it wasn't brought up about 3 years earlier. With some thought, it could also connect the long-term parking to the terminal, reducing the need for the shuttle buses, similar to Chicago's O'Hare airport, which has a people mover that connects 4 terminal buildings, long term parking, and regional rail. Commuter rail there is not connected that way, but comparable to the current Dulles plan (meaning, plan for a long walk from station to terminal).
by another Josh on Jan 20, 2012 11:29 am • link • report
Aren't all trains, buses, cars, and moving sidewalks "people movers"?
by Ward 1 Guy on Jan 20, 2012 11:31 am • link • report
by Aaron on Jan 20, 2012 11:33 am • link • report
I agree there is a need to get rid of some of the exurb stations. Too many riders from there will crowd the already packed orange line segment of the silver line even more than it already is. Also, people movers are far different from busses, they're kind of monorail/air train-esque. http://en.wikipedia.org/wiki/People_mover
by thedofc on Jan 20, 2012 11:42 am • link • report
If we were working with an existing rail line and trying to link it with the airport, this proposal would make far more sense. However we're building an entirely new rail line with the original expressed purpose of connecting Dulles with the rest of the region; it makes no sense to cut out this vital segment.
by John Marzabadi on Jan 20, 2012 11:45 am • link • report
I'm not sure how many people would rule out an option due to an extra transfer, but I am sure it's significantly more than zero.
by Mike on Jan 20, 2012 11:46 am • link • report
Don't we all know how awesome it is that we can ride Metro practically into the airport? Why are we willing to settle for less in Dulles? The idea of transferring to another system kills the appeal of the rail extension in the first place.
by YouStreet on Jan 20, 2012 11:51 am • link • report
Your suggestion about a people mover connecting other parts of the airport (e.g. the daily garages that are quite a hike) is a good one, but it points up yet another problem with the people mover idea. If you're building one, why not have it stop at the daily garage son the way to the terminal? And pretty soon, it's a 15 minute trip from Route 28 to the terminal. Not to mention that the same stagemanagers of security theater will freak out that a people mover would be within 150ft of the terminal.
There is no $70 million savings. $70 million is a rounding error in this project, and as many other have pointed out, even that tiny savings is based on hypothetical plans that haven't been priced out in detail. (Those who point to the supposed "savings" need to be reminded of this every time they raise it. Because $70 million sounds like a lot of money, and for many less informed constituents who will be paying the bill, it soudn slike a reason to favor the idea. It isn't.)
by Paula Product on Jan 20, 2012 11:53 am • link • report
by oboe on Jan 20, 2012 11:57 am • link • report
I don't see any cost savings at all.
We're talking about building an brand new, 1.5 mile people mover system in addition to the Metro line. Atlanta recently opened a separate, landside people mover (different from their airside people mover, which is akin to IAD's AeroTrain) operating over a similar distance (1.5 miles) cost enough that you're not going to realize a net savings simply by eliminating one station.
by Alex B. on Jan 20, 2012 12:20 pm • link • report
by Nicoli on Jan 20, 2012 12:24 pm • link • report
by Lucre on Jan 20, 2012 12:25 pm • link • report
The biggest problem for Metro to Dulles is the fact that it's a 24-hour airport with 19-hour rail service.
by Adam L on Jan 20, 2012 12:31 pm • link • report
by guest on Jan 20, 2012 12:43 pm • link • report
by anon on Jan 20, 2012 12:55 pm • link • report
As others have said its an extra transfer and thus a deterrent.
And as others have pointed out: whats a "people mover"?
Also, in the hypothetical the only way it could work as not an extra step/deterrent is if it dropped you off right across from the ticket counter/security line, and getting that type of access is unlikely.
One more thing; is the station at Rte 28 underground? If not there's an extra deterrent by making people wait outside for the connection, which will almost always not be perfectly timed.
by Tina on Jan 20, 2012 1:03 pm • link • report
by Tina on Jan 20, 2012 1:07 pm • link • report
Will the people mover extension cost less than savings from not building the planned Metrorail loop and station? I wonder.
by John Flack on Jan 20, 2012 1:14 pm • link • report
by John T on Jan 20, 2012 1:15 pm • link • report
by roomd on Jan 20, 2012 1:16 pm • link • report
by NikolasM on Jan 20, 2012 1:19 pm • link • report
Wasn't the cost estimate to place the Metrorail station directly underneath the terminal $600 million?
The nincompoop MWAA board member who brought this idea up should be tarred and feathered.
by Sage on Jan 20, 2012 1:54 pm • link • report
by Pat on Jan 20, 2012 2:05 pm • link • report
by tmtfairfax on Jan 20, 2012 2:18 pm • link • report
It's already been answered more than once in this thread, but not everyone reads every comment. You probably won't read this one either, but I'm going to take a stab at an answer anyway.
A people mover is a generally accepted term (like "light rail" or "commuter rail") for a fully automated vehicle running on a grade-separated guideway. These are typically short circulators, though you can build an entire transit system from one, as is the case in Vancouver, BC.
You can read more about them here:
http://en.wikipedia.org/wiki/People_mover
These are not buses, @John T. They're essentially trains, though they often run on rubber tires or as single vehicles. Since there is no operator on board, their labor costs are essentially zero.
To anyone who thinks we can extend the existing AeroTrain outside of the airport:
The existing AeroTrain at Dulles Airport connects the Terminal to the Midfield Concourses. It is entirely inside the secured portion of the airport.
If it was to be extended beyond the terminal, passengers would be able to bypass the TSA checkpoint by riding the train from Metro directly to the gate. And while many of us would prefer that, the TSA would probably object.
Now, it is possible that Dulles could use the same vehicles and the same operations center to run the landside people mover connection to the Metro. But operationally, the systems have to be separate. At least as long as we have airport security, anyway.
by Matt Johnson on Jan 20, 2012 2:23 pm • link • report
by Sage on Jan 20, 2012 2:37 pm • link • report
This isn't a horrible idea, especially if it puts customers closer to the airport, or somehow ties into the airport's [fantastically expensive] internal people mover system (or forms the basis of a future one). A single-seat ride to the airport is very enticing, but I can find a few advantages of this design.
It would be a hands-down better alternative if Dulles ever built a second terminal, as it'd be extremely unlikely for them to build a second station (or we'd end up with some approximation of the confusing mess of Heathrow's 3 separate stations).
It also provides a more direct route for daily commuters coming in from Loudoun County.
Take a look at the BART connection to SFO for an example of the absolute worst-case combination of rail transit and an airport people mover. Airport users transferring to BART need to use the awkwardly-configured people mover before getting to the train station, which isn't even located on the BART mainline (it stops just short of that). The spur line to the airport is an enormous pain in the ass for BART to operate, results in fewer trains stopping at Millbrae (and fewer trains at the airport than would have otherwise been possible with a station on the mainline).
I honestly can't fathom why it was designed that way (I say this a lot about BART), and it would be an incredibly poor example for IAD to emulate.
The under-construction people mover that will connect OAK to BART is fairly comparable to this proposal, and seems like it will be fairly convenient and efficient, and far more sane and logical than the SFO BART extension.
Another interesting proposal: Connect the train directly to the (secure) AeroTrain, and place a baggage check and TSA screening facility in the Metro station. This will probably never fly, but would certainly be an interesting concept.
by andrew on Jan 20, 2012 2:43 pm • link • report
by goldfish on Jan 20, 2012 3:13 pm • link • report
There goes your $70M savings.
At any rate, you wouldn't be able to stay on the same train, which seems to be what some are suggesting.
You'd have to get off and go through a checkpoint. There would also need to be baggage carousels and ticket counters.
And at that point, you might as well have everyone go through the terminal.
by Matt Johnson on Jan 20, 2012 3:33 pm • link • report
by goldfish on Jan 20, 2012 3:42 pm • link • report
Yes we have a fairly fragile deal, but there's all sorts of risks to it. The new Loudoun Board, which is sort of tea-partyish, is making noises about dropping out. This may have been a misguided attempt to soothe them, to show that MWAA was trying to think of ways to shorten the ride for Loudoun customers.
by jim on Jan 20, 2012 3:58 pm • link • report
I was interpreting your last comment to mean that riders would still undergo screening at the airport, just in a facility carved out from under the airport (at the level of the current AeroTrain).
I see now that you meant that passengers exiting Metro at Route 28/Sully Road station would undergo screening before entering the people mover.
That would mean building an off-site facility for screening, which would not be cheap. As I pointed out before, since riders haven't even reached the airport yet, you'd need not just screening, but also baggage check in, bomb screening machines, a ticket counter for each airline, waiting areas, and restrooms, at a minimum.
Additionally, you wouldn't be able to handle arriving passengers very well. People arriving on airplanes would have their baggage automatically routed to the carousels in the Saarinen terminal. They would either need to exit security, retrieve their bags, re-check their bags, re-enter security, and then re-retrieve their bags at the Route 28/Sully Road station carousel. (This is exactly how passengers arriving from overseas at ATL have to do it if they're exiting at Atlanta).
That doesn't sound efficient. Or cheap.
by Matt Johnson on Jan 20, 2012 4:03 pm • link • report
Sorry, didn't finish that thought. It should read:
"People arriving on airplanes...would either need to exit security... OR have some way of routing their luggage to the Route 28 sub-terminal when they checked it wherever their journey started.
by Matt Johnson on Jan 20, 2012 4:06 pm • link • report
Again, go for the simplest solution: locate the Metro station at IAD, using the original orientation.
by Rudi on Jan 20, 2012 5:26 pm • link • report
How could we justify anything else? After all, the alternative might be cheaper! It might be better in some other way too!
by Gray on Jan 20, 2012 7:36 pm • link • report
MWAA has a long term plan to build a land side people mover on the north side of the main terminal. See Page 6 Volume IV Chapter 4 of the DCMP FEIS. (3.29 MB PDF file).
Alex B is correct, in a way, the cost savings would be real in that it would reduce the local burden to build Phase II by the estimated $70 million. However MWAA would have to come up with more money to extend their proposed land side people mover beyond what they have in their long term plan to connect it to metrorail.
by Sand Box John on Jan 21, 2012 9:27 am • link • report
A direct line to IAD would benefit far more people in the metro area than a direct line to 606.
by HelloMe on Jan 21, 2012 12:17 pm • link • report
Also, with the Dulles Metro Station positioned at the parking garage, there is the possibility of TOD around or over the garage itself (airport hotel & conference center, etc.) which would provide even more bang for the buck.
Lastly, you're losing out using the giant Dulles short term garage as potential metro commuter parking, as opposed to constructing additional parking garages at route 28 and the Loudoun stations.
Why are we even talking about this?
by stevek_fairfax on Jan 21, 2012 2:31 pm • link • report
Finally, the checkpoint would be cheap(er) because it is new construction, not a retrofit.
by goldfish on Jan 21, 2012 10:04 pm • link • report
His piece is good, and for the most part I agree with it, but as someone who has seen the drawings and knows what the specific engineering challenges of the approaches close to the terminal are, I'm saying that if the APM were to follow a similar alignment it would face the same engineering challenges if it were underground, such as the underpinning of the terminal and the maintenance of traffic and landside operations during construction.
Aside from the feasibility of an APM alignment in proximity to the terminal, the realignment of the metro route, and the Preliminary Engineering that would need to be conducted, would add a considerable amount of time and cost to the project which I do not believe that Yonah has factored into his estimate above. I could be wrong, and I do agree with some of Yonah's points, but I believe that at this point in the design process (PE is more than 95% complete) that the costs outweigh the benefits. The time for this talk would have been when PE was below 15-20 percent completion.
by Dan S on Jan 21, 2012 11:08 pm • link • report
by Dan S on Jan 21, 2012 11:12 pm • link • report
I believe you are a transportation consultant. If you are then you should know that in there is a huge penalty associated to transfer and that waiting time is valued twice as high as in vehicle time. So all in all it's a no brainer that the travel timea you assume are wrong as you are forgetting the whole theory of transport behavior in your calculations.
by Vincent on Jan 23, 2012 12:24 am • link • report
by tom veil on Jan 23, 2012 12:57 pm • link • report
I just want to point out that this idea was started by an Airports Authority Board Member.
I actually agree with you on this. If a people mover were built, it would probably end up with a station in the same location as the proposed Metro stop. But Yonah is arguing based on what an MWAA boardmember said was feasible.
It's an IF THEN statement. If you change the IF, the THEN changes, too.
by Matt Johnson on Jan 23, 2012 1:08 pm • link • report
by Mr. Transit on Jan 23, 2012 2:28 pm • link • report
by Brian on Jan 23, 2012 5:25 pm • link • report
My reaction was that this was probably an idea that should be seriously explored. Reading this piece, with the details presented here, I am now convinced that this is as much smarter option.
For those suggesting that this means the whole idea brings us back to a train to nowhere, I assume they are thinking the West Falls Church bus transfer would serve the same purpose, without any new spending.
I cannot agree. That's a very inconvenient transfer, and it's not nearly as quick as this would be. Plus, there is the well-understood idea that trains are more appealing than buses. It's why I'm not convinced that Montgomery County is doing the right thing in replacing light-rail for rapid-transit buses -- but, at least, they're proposing to create a system with a rapid right-of-way. It might be fairly indistinguishable from light rail, except for the type of energy used and the stigma associated with buses. They're also covering a much longer distance and multiple stops, so a bus makes more sense in that case.
With Dulles, a transfer to/from a people mover that comes to the terminal is the exact correct solution to the problem created when the underground Dulles station was abandoned. In fact, if this idea had been floated at the time as an alternative, I suspect it would have been more popular than the distant above-ground station.
Hopefully, the folks at Dulles and Metro will be willing to take a look at this creative and economic solution. Details about whether to create a security checkpoint and access to the secure Aerotrain are far less important than making the decision itself to move to some sort of separate transportation to/from a transfer point at the Route 28 Silver Line stop. It's not as convenient as the original underground terminal station, but it's the next-best alternative.
by Fischy (Ed F.) on Jan 26, 2012 12:04 pm • link • report
by thedofc
-----------------------------------------------------------------------------
Much better to force them on to crowded highways? Or, to drive a while and seek out parking spots at closer-in Metro stops, where they will again be crowding on to the same trains?
by Fischy (Ed F.) on Jan 26, 2012 12:11 pm • link • report
But this idea isn't a solution to any problem. In fact, no one has explicitly stated what the problem is.
The problem, from this Board Member's standpoint, is that costs are too high. And the idea of a completely separate people mover system will not lower the total cost at all, it will raise it. Tremendously.
by Alex B. on Jan 26, 2012 12:14 pm • link • report
Of course, someone needs a design to run the numbers, but the premise that a people mover will be cheaper. I see some discussion above about maintenance cost -- but, of course, Metro tracks have to be maintained, too. Presumably it would be more expensive to maintain the people mover system, but there's no basis to think that will make the system more expensive than the Metro link.
So, without any reason to think this is more expensive, one has to ask whether this does solve a problem. That long walk from the terminal dragging bags (and probably not dressed for temperature extremes) is a problem. This is a neat solution. Maybe the idea of another transfer is off-putting, but I bet those who try it out will be happier for it.
by Fischy (Ed F.) on Jan 26, 2012 1:16 pm • link • report
Cutting the station saves 70 million from the Dulles Metro budget.
IAD's recent Aerotrain people mover cost $1.4 billion. With a B. Atlanta recently opened a 1.4 mile landside automated people mover, similar in scope to this proposal - the initial projected cost was near $700 million.
I've seen no evidence that the combined projects (Metro without a IAD stop + 1.5 mile new people mover) will offer a net savings.
Point being, there's tons of reasons to think it would be more expensive.
by Alex B. on Jan 26, 2012 1:28 pm • link • report
Read my comment above. The Dulles AeroTrain cost $1.4 billion. This would be about half as much at a minimum (inflation and all). Taking out the silver line station would probably equal that amount. The board member said replacing the station with a people mover would save $70 million. $70 million is a blip in this kind of project, 2.5% of the cost of phase II. That will easily be eaten up by cost overruns, and cost overruns will be higher if you have two projects rather than just one project.
Besides the cost problem, there's the problem that the people mover "plan" isn't a plan at all yet AND it relies on some factors that were cut from the Metro plan to decrease costs. It took seven years just to get from contracting to a finished AeroTrain system. This potential people mover is still years away from contracting. So you'll end up with a metro system and no people mover. And the cost cutters will decide that's OK and we'll be on buses from route 28 to Dulles for the next 20 years. If you think the airport/MARC connection at BWI is more convenient than Metro at National then this plan is for you!
In order for the people mover to be a better solution than a metro station, the people mover station would have to be at or underneath the Dulles terminal. That didn't happen with the Metro (in fact the Metro was never going to be right at the terminal), so why would we assume that a people mover plan would come to any other solution?
by MLD on Jan 26, 2012 1:39 pm • link • report
I still think that those using such a system would grow to like it because it could offer something more like door-to-door service -- but it certainly wouldn't be worth the increased cost. If ya'll are right then the idea just throws us back to the costs of the underground station -- which was rejected only for that reason.
by Fischy (Ed F.) on Jan 26, 2012 1:58 pm • link • report
I wrote a very long comment on Yonah's site talking about the engineering challenges specific to this idea. It is copy and pasted below. Before you talk about cost, consider that these challenges are the same reason that MWAA decided to go with the aerial alignment.
Comment:
While I believe that transit lines should come as close to the airports they serve as possible, I agree with Steve K (the post above me) on this one.
I posted a similar post on GGW just a couple minutes ago, but as someone who worked on the DCMP Phase II design (which includes the airport alignment) I can say that the cost estimates for the people mover system, or at least the ones Ive seen on the few articles that float such an idea, are nowhere near what it would cost to build an APM system servicing the terminal with a walking time that Yonah envisions above. This is for a couple of reasons.
The first reason is that if the APM line follows one of the studied metro alignments (the ones that bring it in proximity to the terminal or basically every alignment besides the North Garage Alignment) it would face the same engineering challenges. Some of these challenges include maintenance of traffic and landside operations during construction (which is no small task for a major US airport), passing historic review (by not obstructing the historic view-shed of the Saarinen terminal) if it is not an underground alignment, not obstruct future development on the airports land such as the future east parking garage which is on the airport master plan, and last but certainly not least, underpinning the foundation of the terminal. These are pretty tough challenges and as the design parameters for the APM system would undoubtedly be different than WMATA parameters, an entirely different preliminary design process would be required adding time and cost.
The second reason is that just as the APM line would require more engineering studies, the metro line in the median of the Dulles Greenway would as well. One of the major hurdles for that segment would be finding property for a new traction power substation or TPSS.
The third reason sit that MWAA would have to assume operational costs for the APM in addition to the upfront capital costs. This surely discourages any MWAA board member for voting for this proposal. Assuming, as a cost saving measure, that the vehicles used for this APM system would be similar to those currently in use on in airside operations, a tie-in to the current system would be ideal so that the cars could be serviced in the same service facility. This doesnt have to be a tunnel or anything, but if it isnt than that poses another logistical challenge as the facility is closer to the south central portion of the property.
As a disclaimer I dont know how the estimate was made but I just figured I would let folks who werent as familiar with the project know about some of the specific engineering challenges. I actually think this may have been an effective proposal earlier in the project however at this point in the design process, I dont believe it would be cost effective. If you have any other questions or need clarification PLEASE dont hesitate to ask. I dont expect the above to make complete sense.
Second comment:
As a part of the Airport Alignment Alternatives Analysis, an in depth engineering analysis of the Airport segment, 5 Alternatives to what is referred to as the Main Baseline Tunnel (MBT) were studied. The main baseline tunnel was the original tunnel alignment considered in the first wave of preliminary engineering. As cost went up and mitigation efforts began, the MBT alignment was trimmed and trimmed. Eventually an alternatives analysis was performed.
The first alternative outlined in the analysis (Alt 1) is an arrivals level aerial alignment. This alignment would have placed the station immediately in front of the terminal where the current arrivals ramp for passenger vehicles is. The pros: relatively short walking time, not underground (so initial cost wouldnt be as much as an underground station in the same spot), no landside facilities would be lost. The cons: Disruption of landside ops and Maintenance of Traffic (MOT; it should be noted that this alt would probably be the worst out of all the alternatives in this regard), possible obstruction of historic view-shed of the terminal.
The second alternative outlined in the analysis (alt 2) is a tunnel alignment underneath the terminal. This would have placed the station under the right center of the terminal. This right-center location was necessary so that the alignment moving outbound from the station would be able to reach the surface and not encounter existing foundations and structures. The pros: Short walking time (probably the shortest of all the alignments), underground station (arguably more comfortable for passengers b/c of climate control), minimal disruption to MOT. The cons: Loss of landside ops space, (because of the location of this station directly underneath the terminal, all ancillary facilities would need to be located at ground level because of the additional cost of tunneling beneath the terminal), construction difficulty (you are underpinning a massive terminal building here the technical challenges of this endeavor would inevitably present some problems during construction in addition to adding total time to construction), cost (this would have been by far the most expensive although I cannot give you a hard estimate because I cant remember the numbers).
The third alignment outlined in the analysis is MBT alternative 4A which has a modified tunnel alignment mined with TBM with a cut and cover station underneath the pedestrian tunnel node coming from the north parking garage. This is the commonly known tunnel alignment which was being considered before the MWAA board decided to run with the aerial alignment. Pros: relatively short walking distance (to both sides of the terminal), passenger comfort, no disruption to view-shed. Cons: Cost is more than an aerial structure (less than other tunnels), there would be disruption to parking operations in the parking bowl in front of the terminal during construction of the station.
The fourth alignment (alt 4b) is the exact same alignment except done by cut and cover method the entire way. The only additional pros or cons to this are both cons. The estimated cost was a little higher than alt 4A and the disruption of traffic during construction would obviously be worse.
The fifth alignment (alt 5) is the commonly known North Garage Aerial Alignment.
As you probably know if butts up to the south face of the North Garage and is aerial for the entire length of the alignment. This is the preferred alternative for the MWAA board at the moment. Pros: least expensive option (thats all i can think of hahahah). Cons: obstructs historic view, longest walk time of any of the alternatives, not climate controlled (although there will be a canopy covering the platform).
I have a brief PowerPoint I put together with some great graphics if you would like me to email it to you I definitely can.
Hopefully that should clarify some topics.
by Dan S on Jan 26, 2012 3:02 pm • link • report
Add a Comment