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| Re: W train returning when Phase I of the 2nd Av subway opens in December 2016?. (1386722) | |||
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Re: W train returning when Phase I of the 2nd Av subway opens in December 2016?. |
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Posted by Stephen Bauman on Tue Feb 23 22:22:04 2016, in response to Re: W train returning when Phase I of the 2nd Av subway opens in December 2016?., posted by AlM on Tue Feb 23 20:11:33 2016. I would estimate that the standard deviation of dwell time is at least 20 seconds, possibly more, and it's not due to C/Rs who are unfocusedThe actual dwell time is only part of the equation. You also need to know the headway from the last train. One would expect dwell time to increase with increased headway, due to increased passengers flow. Assume a 30 tph service level (120 second headway). The 30 second quantiztion level is 25% of the mean. That alone accounts for 7.5 seconds variation in loading time. I've also measured braking and acceleration rates when the lines were not crowded. The standard deviation in each ran around 33% of the mean. That's another +/- 20 seconds difference in headway. There's the adage: if you cannot be good be consistent. The idea being one can get better if there's a stationary target. NYCT operations are neither good nor consistent. The precision you advocate seems to be undermined by the riders. The riders did not decide to measure time with a sundial. NYCT is blaming its shortcomings on its victims. It's hardly a phenomenon unique to NYCT. |
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