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| Re: Update on WMATA almost accident from a while back (1403815) | |||
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Re: Update on WMATA almost accident from a while back |
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Posted by Michael549 on Fri Jul 29 20:54:14 2016, in response to Re: Update on WMATA almost accident from a while back, posted by Sand Box John on Fri Jul 29 10:22:40 2016. Here's the part I'm confused about.In the NYC subway, when there are track switches, there are double-headed signal fixtures that indicate the usual route and diverging route. When the switch is set for the diverging path - as I understand it that switch can not move if there's a train on that pathway headed in the direction where a crash is likely to happen. Unless you are saying that a train operator could "key-by" a red-signal and then take the track switch and then head straight for an opposing train. I don't believe you're saying that, but I want to be clear. -- In the WMATA accident, there's the non-ability it seems to stop a train that has dis-regarded a red signal AND taken a switched pathway that placed the train in the path of an on-coming train. In the past I know that "keying by" was used in the past to close the distance between two trains, say train 1 is at the platform, and train 2 is literally right behind it. In this example, both train 1 & train 2 are traveling in the same direction. I don't believe (or won't to believe) that "keying by" was used in operations where there were are opposing trains with riders on board. Mike |
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