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| Re: Re :(Speed ) TA is obsessed with CBTC, and ''New'' tech for no reason. (581349) | |||
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Re: Re :(Speed ) TA is obsessed with CBTC, and ''New'' tech for no reason. |
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Posted by RonInBayside on Wed Mar 5 21:07:02 2008, in response to Re :(Speed ) TA is obsessed with CBTC, and ''New'' tech for no reason., posted by Jeff H. on Wed Mar 5 20:57:27 2008. "Incidentally, especially with microprocessor control, accelerationrates of 4.0 or even 5.0 are possible without sacrificing comfort. The ERPCC also found, through extensive testing, that it is the rate of change of acceleration (the so-called "jerk" rate) which contributes to discomfort or injury. " Your notes about jerk are much appreciated. As to the public liking a 5 mph/s acceleration rate, seated, maybe; I'm skeptical in standing situations where you might not be firmly attached to a pole, or you are weighted down with a heavy bag, or with kids... With the short distance between stations in New York, it really doesn't make much difference. If an express only saves 30 seconds per skipped stop, what do you really expect to save accelerating say 25% faster than you do now? I agree that running the express 50-60 mph on most lines would help compared with 30 mph. But you can even improve operations at 30-35 mph, by reducing the number of events that interrupt the run. Make sure the train sees green lights between stops; reduce the number of times trains get bunched together; smooth out merge events; reduce delays due to unexpected events. (I got the chance to help once: I helped get a sick passenger off a 5 train at Grand Central a lot faster than it would have happened otherwise. We got the passenger up to an ambulance; the train departed and service resumed. |
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