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by Lance on Jul 22, 2009 9:19 am
by tom veil on Jul 22, 2009 9:30 am
by David Alpert on Jul 22, 2009 9:34 am
by kreeggo on Jul 22, 2009 9:38 am
by Paul S on Jul 22, 2009 10:18 am
by Steve on Jul 22, 2009 11:03 am
by Steve O on Jul 22, 2009 11:58 am
How do the GPS units provide positive control to prevent collisions?
How does the GPS work underground or in tunnels?
by Michael Perkins on Jul 22, 2009 12:16 pm
Via satellite dishes, but you might not need central control for a backup system. One way is to decentralize control for redundancy of failsafes, as is done in CBTC, so that the computers onboard the train know where other trains are and how to adjust speed appropriately.
How do the GPS units provide positive control to prevent collisions?
Plenty of ways. If they can be synchronized to a GIS database that knows where the blocks are, or simply know what safe distances between trains are, then you just have to hook them up to the ATO. Again, this is a technical problem, not a conceptual one.
How does the GPS work underground or in tunnels?
Well, that's pretty much an insurmountable problem.
by цarьchitect on Jul 22, 2009 12:30 pm
We know that the next ten years or so is going to necessitate major overhauls for Metrorail. I wouldn't be surprised if a modernized train control system were at least considered among that. In speccing out the 7000 series rail cars WMATA's already said they're going to significantly update control systems.
by Distantantennas on Jul 22, 2009 12:35 pm
by Steve on Jul 22, 2009 12:38 pm
Guidance isn't the problem -- a fully digital odometer, gyroscope, and compass can tell an underground robot where it is on a map. The real problem with tunnel-boring robots is that they don't know what to do when they hit unexpected objects, like undocumented sewer pipes or anomalous geological formations. You need to have a human inside the machine to make decisions in those situations.
by tom veil on Jul 22, 2009 2:00 pm
Sadly, various photos I have of this area during the construction of the buildings don't fully show this spot.
http://www.flickr.com/photos/rllayman/2439557196/in/photostream/
You might be more right than me. But I would aver with the finished construction of the building, that the slip lane should have been removed whether or not the street goes to two way (which it should).
And it's not indicated on page 6 of the Mt. Vernon Triangle Public Realm plan:
http://www.ddot.dc.gov/ddot/frames.asp?doc=/ddot/lib/ddot/mtvernonsq/docs/mtvernonsq_finalreport.pdf
by Richard Laymanr on Jul 22, 2009 2:35 pm
You might consider using Google Earth, the satellite photography can be selected by date. I think the photos in Google maps date from c.2007 and the slip lane is there
by Steve on Jul 22, 2009 2:45 pm
by Paul S on Jul 22, 2009 3:23 pm
I will add an addendum to my blog entry, covering this.
by Richard Layman on Jul 22, 2009 3:55 pm