Transit
More weekend closures, less single-tracking for Metrorail
To save time and money, Metro is revising the way they do some track work. Instead of single-tracking through work zones, Metro will now close whole line segments more often.
When BART was being designed, a 1971 article in the IEEE Transactions on Industry and General Applications described its system for avoiding shutdowns by single-tracking:
The BART system will provide service at 90-s intervals during peak demand periods, extending to as long as 15-min intervals during the low-demand early morning hours. At no time will service be discontinued; by the use of carefully placed crossovers and the control of trains in a reverse running mode, maintenance work on the roadbed can be performed without serious disruption of the service.
But in 1971 BART had yet to open, and the Metrorail system had only broken ground two years earlier. Operating experience in the years since has shown that while single-tracking may preserve service, it does so at the expense of lengthened headways and disruptions along the entire length of the line.
Today, taking this experience into account, WMATA has announced a new approach to weekend track work on the Metrorail system, in which entire sections of lines will be closed and replaced with buses.
Single-tracking doesn't just disrupt riders in the work area itself; it slows down the entire line, and affects riders throughout the Metrorail system.
WMATA's new approach to track work will preserve service on the open portions of lines, and avoid the follow-on effects which usually occur when trains are single-tracking.
Closing lines to speed repairs is, by itself, nothing new. In 2006, London Underground elected to close the Waterloo & City Line in its entirety for five months, in order to avoid a projected 70 weekend closures necessary to complete the major overhaul of the line.
Because of the complete closure, weekday riders who would have been spared disruption under a program of weekend closures instead had to take alternate routes. But because the complete closure was more efficient, the work was done (and the disruption ended) in 5 months, rather than in more than a year for weekend closures alone.
New York City's MTA has also been examining partial line closures as an alternative to frequent evening and weekend disruption. No decision has been made yet, but MTA Chairman Jay Walder seems to think it's a strategy that's proven itself in London, and which may prove viable in New York as well.
So, how well will this strategy work for Metrorail? At the extremities of lines, complete closures will probably be superior to single-tracking. Work will go faster with no trains running through the work areas, and the unaffected parts of the line won't have to contend with the bottleneck caused by single-tracking. In the core of the network, though, where ridership levels are high even on weekends, shuttle buses may end up swamped with passengers, leading to delays for riders traveling through the closed areas.
In the end, riders will face disruption whether trains are single-tracking or replaced with shuttle buses
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by James on Jun 10, 2011 10:44 am • link • report
by Redline SOS on Jun 10, 2011 10:50 am • link • report
I'd be interested to see how many people rode shuttle buses vs. a normal weekend of metro service. Usually we hear that shuttle bus service is terrible but I heard a bunch of positive comments about the service that weekend.
by MLD on Jun 10, 2011 10:52 am • link • report
by Dizzy on Jun 10, 2011 10:53 am • link • report
by JessMan on Jun 10, 2011 10:56 am • link • report
For point #2, rather than bus service, why not split the line into two sections (as they would do with a bus-bridge service), but then run a single-track shuttle in the middle? If a patron needs to travel across the afflicted section, he can get off the first train and walk across the platform to the shuttle train and transfer.
It's a hassle for a rider, but it's way easier than switching to a bus on the surface. And it keeps the trains on the other sections operating more like normal.
by Joey on Jun 10, 2011 10:57 am • link • report
Switches are located so that a train crosses one approximately every 4-5 minutes. That would allow 10 minute headway during single-tracking.
by Matt Johnson on Jun 10, 2011 10:58 am • link • report
by canaan on Jun 10, 2011 11:04 am • link • report
by Canaan on Jun 10, 2011 11:07 am • link • report
You can see all of the switches in the system in Sand Box John's track schematic: http://mysite.verizon.net/cambronj/wmata/sys_schematic_ars.gif
by Dizzy on Jun 10, 2011 11:12 am • link • report
by Matt on Jun 10, 2011 11:12 am • link • report
Chicago shut down the southern portion of the Green Line through the South Side for more than two years for a full rehab in the 90s. It took a long time after the resumption of service for ridership to recover to previous levels.
by Alex B. on Jun 10, 2011 11:16 am • link • report
Let's say they do construction at Braddock Road and run the blue line from Largo to National and from King St to Springfield (and similarly with the yellow line). Who in their right mind would prefer to sit on a train doing 5 mph through most of the system because of the single tracking versus going full speed on the two segments with the minor inconvenience of a shuttle?
Last year, they did weekend construction at Arlington Cemetery and Pentagon that closed portions of the blue and yellow lines. There was a shuttle from Rosslyn to Pentagon City or L'Enfant to Pentagon City. I took a shuttle from Rosslyn and it was fine. I waited MAYBE 3 minutes for the bus and got there with no problem in just a little longer than it would have taken on the train. No horror stories like you read online. That minor inconvenience is less time than you'd sit outside a station waiting for the oncoming train to pass through the single track section.
I know we like to complain about WMATA a lot, but they got this one right. Good job.
by Sam on Jun 10, 2011 11:17 am • link • report
+1
by Jasper on Jun 10, 2011 11:18 am • link • report
by David C on Jun 10, 2011 11:26 am • link • report
The free shuttle service was amazingly reliable. The shuttles were coming every couple of minutes. In fact, my friends and I joked that they should keep the shuttle service and screw the metro! There were metro employees at every shuttle stop to answer questions, which was probably very helpful for all the lost tourists.
I'm a major metro critic, but if they can offer this reliable kind of shuttle service every time there's a closure I believe closing entire sections of the system is better than single-tracking.
by MJ on Jun 10, 2011 11:31 am • link • report
If you exit at one of the endpoints of the closure and reenter at the other endpoint, you don't tap your SmarTrip at either end, and therefore are not charged the base fare again.
If you plan to reenter somewhere else, you have to tap out, or your card won't work properly.
So, for instance, let's say the Orange Line was closed from Foggy Bottom to McPherson Square. Let's pretend you want to go from Court House to Capitol South.
You could ride the train from Court House to Foggy Bottom and then exit without tapping. You can then take the shuttle or bikeshare or walk to get to McPherson Square, where you would then reboard and travel to Capitol South.
If, on the other hand, you were going to Silver Spring, and you decided to bridge the gap by walking or biking from Foggy Bottom to Farragut North, you'd have to tap out at Foggy Bottom and tap in at Farragut North.
by Matt Johnson on Jun 10, 2011 11:32 am • link • report
And with the Waterloo & City line example, for those of you unfamiliar with the London Underground, it's a line that has two (yes two) stations. And those two stations are served by other lines, so essentially it's just an express service. So I don't think it's a good example for WMATA to use.
by Steven Yates on Jun 10, 2011 11:32 am • link • report
by Nicoli on Jun 10, 2011 11:34 am • link • report
by Adam L on Jun 10, 2011 11:40 am • link • report
The odds of you encountering a closed station on a given weekend are likely going to be quite low.
On single-tracking days, the odds of encountering delays resulting from the maintenance are nearly 100%. If weekend headways do improve, this change will definitely have me using Metro more often on weekends.
The "shuttle train" is an interesting idea, although switch replacements do require the entire segment to be closed, given that they (by definition) require work on both tracks. This change will cut an entire year off of the project, which I think is significant enough to warrant some minor inconvenience.
Dan Stessel told me that they are *not* planning to use this strategy downtown, except for switch replacements, when it's required. So, no Union Station to Dupont shuttles.
I've been advocating for this change for a while, and I'm glad to see it put into place. The Red Line has been unusable on weekends recently. The old schedule sucked, with 30 minute waits, followed by one packed train and two empty trains all in very quick succession.
(An alternate idea is to keep single-tracking, and run short-turn trains between the single-tracking zones. Metro tried this a few months ago with Van Ness to NY Ave trains. Ironically, downtown Red Line riders enjoyed some of the best weekend service that's ever been offered on the line on those days, with consistent 5-6 minute headways all day.)
by andrew on Jun 10, 2011 11:45 am • link • report
P.S. London Underground is a bad comparison, that network is much more redundant.
by renegade09 on Jun 10, 2011 11:48 am • link • report
by Michael Perkins on Jun 10, 2011 11:49 am • link • report
And what is the headway on the Orange Line during weekends? Or late night?
Just shut the entire line down for the weekend. Save some salaries. I wonder how long it would take to actually re-do "track work" -- which I suspect is mostly ATC repair -- if they shut down all of WMTA rail. A month? Two? Six?
by charlie on Jun 10, 2011 11:55 am • link • report
Is DC Metro really a subway system, rather than a suburban commuter rail?
So, aren't we all supposed to have cars as options on the weekend and evenings?
by ed on Jun 10, 2011 1:09 pm • link • report
If you mean that there are more stations downtown, then yeah. It's a not-great comparison. As has been mentioned many times before, Metro is a "hybrid" system that is fundamentally different from a pure urban rail network such as the Underground or NYC Subway. DC's also a much smaller city.
On the other hand, if you're talking about operational flexibility with regards to single-tracking and ability to re-route service, London might actually be worse. Like DC, their network does not contain many (any?) express tracks, and very little of it is configured to allow trains to run in the "wrong" direction for singletracking. If a train gets stuck, they're screwed.
To contrast, 100% of Metro's network is bidirectionally signaled. If we decided that we wanted to start driving all of our trains on the left tomorrow, we could do that with fairly minimal fuss. 100% of our rolling stock is also compatible on any track, and can be coupled to any other WMATA railcar. (On the downside, Metro has very few connections between lines. This was stupid, and a mistake that we probably won't make again when expanding the system.)
It's not at all uncommon for London to close entire lines, or significant portions of lines on weekends for years on end. The East London Line closed entirely for 2 1/2 years to be extended and rebuilt as a Commuter Rail line.
by andrew on Jun 10, 2011 1:52 pm • link • report
Is DC Metro really a subway system, rather than a suburban commuter rail?
So, aren't we all supposed to have cars as options on the weekend and evenings?"
What do you do when a road is closed along your route? Surely you don't throw a fit about it... you probably find an alternate route or mode of transportation. Take a bus. Ride a bike. Walk. Take the shuttle that would operate between closed stations. Rent a car. Borrow a car. Ask a friend for a ride.
by Sam on Jun 10, 2011 2:50 pm • link • report
Cannot afford that car-- only then will I really have options.
Renting cars is really expensive, and would have to travel all the way to my friends' places in order to borrow their cars -- you know, on those weekends-- the times when the friends are probably using those cars anyways....
And let's not talk about buses - buses are depressingly slow and infrequent, esp on weekends and evenings. I would prefer to stay indoors or walk locally. I would rather slit my wrist than take buses anymore.
So, Yeah, Sam. I'm buying a bike. Won't join the Lycra Brigade, but...
by ed on Jun 10, 2011 4:30 pm • link • report
by Kate W on Jun 10, 2011 4:35 pm • link • report
What is wrong with people? Rather slit your wrist than take the bus? I take the bus every day of the week and it's more enjoyable than being crammed on the metro during rush hour.
Learn to use NextBus and the bus becomes far more convenient.
by MLD on Jun 10, 2011 4:52 pm • link • report
What about non-rush hour times? On weekends and evenings too?
Those are the depressing/ frustrating times I am talking about ---- on this thread about weekend closures...
by ed on Jun 10, 2011 5:47 pm • link • report
"We cant run 24 hours because necessary maintenance must be done!"
And yet here we are, and apparently, no necessary maintenance has been going on between 12 and 5am every day.
by JJJJJ on Jun 11, 2011 12:02 am • link • report
by Doug on Jun 11, 2011 9:03 pm • link • report
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