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| Re: Real Long Read On NYCPropulsion/Braking (334285) | |||
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Re: Real Long Read On NYCPropulsion/Braking |
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Posted by randyo on Sun Nov 5 18:01:42 2006, in response to Re: Real Long Read On NYCPropulsion/Braking, posted by Stephen Bauman on Sat Nov 4 09:03:54 2006. If you know anything about NYCT signalling, except in areas where station time signalling is present, signals are a full train length apart which for the BMT Eastern Division would be 536 ft for an 8 car train of steels and 480 ft for an 8 car train of R types. I'm not even talking about CBTC here but just state of the art wayside signalling. Since with the retaining circuits which were originally common only on the BMT and IND Divisions and now also on the IRT Division, since the stop arm immediately behind the train is down, there are always 2 red signals behind each train so that with 2 red signals behind a train, the stopping distance should be 1072 ft based on the length of the steels or 960 ft if the distance is based only on R type equipment. Even with the signal spacing as more accurately described, the distance between the rear of the train and the raised stop arm is only 542 ft. Also take into consideration that the signals I spoke of were on the upgrade of the bridge and not in an area governed by grade time signals and that a BU would in alll likelihood not have been able to achieve the same speed as a SMEE type on the upgrade. Therefore, with the absence of grade time signalling in that particular area, the signal spacing would definitely have an impact on the ability of a train to stop in sufficient time. |
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