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| Re :(Speed ) TA is obsessed with CBTC, and ''New'' tech for no reason. (581337) | |||
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Re :(Speed ) TA is obsessed with CBTC, and ''New'' tech for no reason. |
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Posted by Jeff H. on Wed Mar 5 20:57:27 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. Ron, the public might not like the sensation of hard acceleration,but they do like the indirect benefits. Quicker acceleration rates mean improved headways. Higher acceleration and higher running speeds means improved schedule speed. Although you could argue that it really doesn't matter if your trip is shortened by 5 minutes (although trying having that argument with a real new yorker and see what happens), reducing schedule speeds means that in order to move the same number of people, you need more rolling stock and more crews. Guess what, there is a cost associated with increased equipment and increased labor. The public does not want to pay more for service. What the Electric Railway Presidents' Conference Committee discovered in the early 1930s is still valid today: The highest acceleration, braking and speeds consistent with safety and comfort are desirable in transit service. Incidentally, especially with microprocessor control, acceleration rates 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. |
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