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| Re: QueensWay gets $444,000 grant form NY State to design the first phase (1328799) | |||
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Re: QueensWay gets $444,000 grant form NY State to design the first phase |
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Posted by Stephen Bauman on Wed Dec 17 21:12:28 2014, in response to Re: QueensWay gets $444,000 grant form NY State to design the first phase, posted by Terrapin Station on Wed Dec 17 20:05:59 2014. The SAS FEIS was written to justify building the SAS. They could not present anything that would question its necessity.One item they did not present in the FEIS was the fact that they ran 32 tph during the 1950's. The line also handled more peak passengers at that time. Dwell time is determined by train headway. The less the headway, the less time for passengers to accumulate on the platform. More importantly for maintaining a schedule, the variance of the number of people accumulating is proportional to the duration. I've made measurements during the am rush hour at Grand Central (and all the other express stations on the Lex.) There is a great variability in arrival time between trains. However, when the interval was within that for 32 tph, the dwell time was also low. 40 tph should be the nominal service level capacity for intermediate stations. There are some unique factors on the Lex express that bring this figure down to the mid 30's. Ironically, the major limiting factor is not the ones most cited by the TA - Grand Central and Union Square. |
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