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| Re: 2nd Ave Subway Setback (811669) | |||
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Re: 2nd Ave Subway Setback |
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Posted by Stephen Bauman on Wed Jul 22 11:41:59 2009, in response to Re: 2nd Ave Subway Setback, posted by Easy on Wed Jul 22 09:10:45 2009. dwell times aren't the only reason for delays in the NYC subwayI was talking about capacity not operating delays. Increase the station dwell time by design and the maximum tph will decrease. If you want to compare capacity in the real world, look at the Moscow Metro. It is slightly shorter than the NYC subway, and has far fewer stations, yet carries 50% more riders. And it carries them much more on schedule because they don't have all the delays associated with merging and diverging lines... It's fairly difficult to extrapolate from gross ridership statistics to peak dwell time. When are the extra 50% of Moscow's riders carried? NYCT reports that 46% of the riders used the subway during the rush hours (6 hours) and 54% of the riders used the subway for the remaining 18 hours. If Moscow's numbers are less skewed, despite not operating at night, then the figure of 50% more riders is less relevant regarding its effect on peak period dwell time. Moscow's system has a simpler topology than New York. However, the factors required to operate merges/diverges on time are the same factors required to operate high service levels. New York's complexity is a red herring brought up by NYCT's management to excuse their poor utilization of the existing system. Here's another real world example. The BOT reported that the August 1949 peak AM service level on the Third Avenue El was 42 tph with 21 tph each going to South Ferry and City Hall. Northern terminals were: 129th St (7 tph); Bronx Park (25 tph) and E 241st St (10 tph). The section between Gun Hill Rd and E 241st St also featured subway service (15 tph) for a combined 25 tph. While the merge/diverge at Chatham Sq and Gun Hill Rd were grade separated, those at 129th and Bronx Park were at grade. |
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