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| Re: Retread PHOTOS: NYC Subway Vanishing Railfan Windows (1238085) | |||
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Re: Retread PHOTOS: NYC Subway Vanishing Railfan Windows |
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Posted by randyo on Sun Jul 28 18:45:31 2013, in response to Retread PHOTOS: NYC Subway Vanishing Railfan Windows, posted by Jersey Mike on Sun Jul 28 14:34:49 2013. Nice pics. As for the "approach medium" N/O BBC, subway interlocking signals are nothing like class 1 RR signals which are primarily speed signals. NYCTA interlocking signals are route signals. The top portion indicates the condition of the road ahead and the bottom portion indicates the route to be taken: green for the main route and yellow for the diverging route. The signal N/O BBc indicates to proceed with caution on the main route (A3 Tk) into BBC station. In the case of a train immediately ahead both top and bottom show red. The IRT signals used to be closer to standard RR signals in the the top portion indicated the main route and the bottom portion indicated the diverging route. The last place on the IRT with the old style signals was, and may still be, the area around E 180 and the Dyre Line although since I haven't been up there in a while, those signals may by now have been replaced by the new signals. |
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