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Re: Rush hour J to 9 Av

Posted by randyo on Sun Apr 15 17:31:44 2012, in response to Re: Rush hour J to 9 Av, posted by J trainloco on Sun Apr 15 17:24:58 2012.

The problem is that signals that are supposed to be set at 30 MPH (or any speed for that matter) are often set much lower than the posted speed. A former senior director of service planning recommended that the speed at which the GTs cleared should be about 2 or 3 MPH HIGHER than the posted speed so that the trains would actually operate at that speed, a technique which he claimed was used in Chicago. I have seen many locations on the IND with the old signaling which was supposed to be accurate where the speed was often 5 MPH or more under what was posted. In the old days before trains had speedometers, it wasn't necessarily so obvious but now with most of not all the equipment having speedometers the discrepancy is very obvious.

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