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| Re: 12 car WMATA train (628621) | |||
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Re: 12 car WMATA train |
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Posted by Sand Box John on Thu Jun 5 00:19:10 2008, in response to Re: 12 car WMATA train, posted by Charles G on Wed Jun 4 13:38:29 2008. That is only true if the marker for 6-car trains are set so that the train is perfectly centered on the platform. In NYC, the markers for short trains are sometimes at the front of the platform or rear of the platform (depending on inclines in the station or where the entrance/exit is located, I've assumed).If the marker were at the front of the platform at one station, 8 cars might have platformed there and taken on passengers. At a later station, with a centered marker the 8th car could have opened it's doors into the tunnel. My post is hypothetical -- I don't know whether all the markers are centered on WMATA. The stop marks are at the same location in all of the station 2, 4, 6 and 8. They are virtual marks (Most station have 4, 6 and 8 car stop mark signs). All trains shorter the 8 cars are programmed to stop at the center of the platform. Only one station is configured to long or short stop trains that are less then 8 cars long. That station is Gallery Place on the Red line. Trains less then 8 cars to Shady Grove short stop, trains less then 8 cars to Glenmont long stop. The program station stop part of the train control system tell the train where to stop at the platform. The program station stop function is executed when the rear end of the first car in the train passes over the marker coil pair located 2700' from the center of the platform. Train shorter then 8 cars that short or long stop at a platform are programmed to do so using the long short station stop control setting. Incline is not an issue on metrorail as all but 4 stations are inclined at 0.035% over the full length of the platform. The other 4 are level. John in the sand box of Maryland's eastern shore. |
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