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| Re: SAS termini questions (127389) | |||
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Re: SAS termini questions |
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Posted by Stephen Bauman on Mon Aug 15 19:27:03 2005, in response to Re: SAS termini questions, posted by stephenk on Mon Aug 15 17:47:09 2005. how many metro trains run within seconds of their schedule during the peaks?Those that operate at service levels in excess of 35 tph. the more shallow curve radii of the higher speed crossover would lengthen the crossover, I'm not considering 50 mph switches, only 20 mph switches vs 10 mph switches. It provides sufficient margin for 40 tph operation. Your own analysis for Victoria and Bakerloo lines shows that 50 mph switches and ATO is not only overkill but does not work in practice. Some of this may be because reversing in platforms always suffers from time being wasted from the departing trains getting the green light, to actually departing. This did not happen, when Times Sq was operating at 36 tph. The reverse direction T/O was waiting on the platform at the T/O position when the train came in. The C/R knew that the closing lights would come on in 2.5 minutes. He did not wander far from his station. Personal breaks were on the other end with 3 different terminals making that direction reversal far more leisurely. is the reason why the Flushing Line now only runs 27tph, due to less demand, or TA cost cutting? A combination of both. Rush hour loads are not as high as the mid 1950's. OTOH, trains have been lengthened from 9 to 11 cars. Yes, they did operate 36 tph with 11-car trains. They also operated 34 tph on the Queens Blvd line with 11-car (660 foot) trains in the mid 1950's. |
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