|
|
| Re: [Bloomberg news] ... MTA vs. WMATA: Why Metro Is Terrible (1167748) | |||
 |
|||
| Home > SubChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: [Bloomberg news] ... MTA vs. WMATA: Why Metro Is Terrible |
|
|
Posted by Sand Box John on Sun Jul 22 00:18:01 2012, in response to Re: [Bloomberg news] ... MTA vs. WMATA: Why Metro Is Terrible, posted by WMATAGMOAGH on Sat Jul 21 17:16:52 2012. An 8 car train is able to be operated automatically, but deferred maintenance has resulted in the equipment that would bring a train to a stop at the exact right spot not able to work well enough to do that reliably. Sand Box John might be able to elaborate more.The subsystem that controls automatic station stops is primarily a train board subsystem. The subsystem responds to passive coils (marker coils). There are total of 14 coils on each track, 7 on each side of the center of the platform. They are placed 167' 484' 1,200' and 2,700' from the center of the platform. The 167' location has a single coil, the other 3 locations have pairs. 1 coil in the pairs at the 484' and 1,200 locations are variable frequency coils that have the functionality to program a train with less then 8 cars to stop long or short of the center of the platform when set to do so.  167' marker coil schuminweb.com If 2 or more of the marker coils are broken, missing or out of calibration automatic station stop will fail to function properly. If the wheels on the axle that count wheel revolutions is not calibrated to the actual diameter of the wheels the train will not stop accurately. John in the sand box of Maryland's eastern shore. |
|
(There are no responses to this message.)
|
|