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| Re: WMATA sank into crisis despite decades of warnings (1393714) | |||
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Re: WMATA sank into crisis despite decades of warnings |
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Posted by Sand Box John on Tue Apr 26 23:50:34 2016, in response to Re: WMATA sank into crisis despite decades of warnings, posted by Jackson Park B Train on Tue Apr 26 22:43:27 2016. unfortunately, and as always, the biggest losers are the citizens who paid for a full featured system and got lemons that have never performed as claimed in the pre revenue agit-prop. The cutesy flashing lights at the platform edges are a great example of expensive silliness which IINM turn out to mess with the train positioning hardware.The edge lights have nothing to do with the berthing of trains at station platforms. The automatic stopping of trains is a function that is executed by train board hard in response to fixed position way side hardware. The wayside hardware has the capability of instructing trains that are less then 8 cars long to stop short, center or long at the platform. All the light flash along the entire length of the platform regardless of the length of the train or where it is programed to automatically stop. I will note that the original schema was to have the light flash only where a train that was less then 8 cars long would stop. It did that by using the short, center or long instruction along with same data that local train control sends back to the ROCC that identifies the train length and direction. The schema was never implemented, however the edge light were and sill are wired as 8 circuits that are 75' long each. John in the sand box of Maryland's eastern shore. |
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