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| Re: TA is obsessed with CBTC, and ''New'' tech for no reason. (581315) | |||
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Re: TA is obsessed with CBTC, and ''New'' tech for no reason. |
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Posted by trainsarefun on Wed Mar 5 20:25:57 2008, in response to Re: TA is obsessed with CBTC, and ''New'' tech for no reason., posted by RonInBayside on Wed Mar 5 09:55:16 2008. Rapid acceleration beyond 3 mph/s is mnot wanted by the public because it is uncomfortable when you have to stand.I think it has more to do with the jerk - the rate of change of acceleration with respect to time, or the third derivative with respect to time of the position-time function. Some train operators on older trains - especially R40/42 sets, which have good acceleration out of a stop to begin with up to at least 10 mph at least - create a lot of jerk by pulling back the controller all the way before the train has even closed up the doors, and the brakes are already released - a lot of faith to put into the door circuits, I guess - which makes it an uncomfortable, and probably unsafe, start. |
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