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| Re: Some Subways Found Packed Past Capacity (452993) | |||
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Re: Some Subways Found Packed Past Capacity |
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Posted by Stephen Bauman on Thu Jun 28 07:04:57 2007, in response to Re: Some Subways Found Packed Past Capacity, posted by shadyelstation on Wed Jun 27 12:19:35 2007. There is the at-grade crossing at MyrtleGrade crossings such as those at Bway-Myrtle and at Lenox-143rd do not limit capacity. One simply schedules diverging (and straight through) trains in both directions to enter the crossing at the same time. The Third Ave El operated at 42 tph with grade crossings. then there's the Williamsburg Bridge. Slow speeds do not limit capacity per se. Capacity limitations are caused by actual stopping (dwell) time inside stations. One exception is when the slow speed is at the entrance or exit of a station. However, that generally brings service levels from near 40 down to the low to mid 30's. Back in 1949, they operated 27 tph over the WB, rating its capacity at 32 tph. The Myrtle and Canarsie ran 8 tph each and Jamaica ran 11 tph. |
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