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| Re: Future expansion wish list? (877875) | |||
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Re: Future expansion wish list? |
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Posted by trainsarefun on Fri Dec 25 20:33:35 2009, in response to Re: Future expansion wish list?, posted by AEM-7AC #901 on Fri Dec 25 20:12:37 2009. I'm almost tempted to say that NYCTA should move to CBTC and aim for a moving block system on the Queens Railway.I'm not sure that this wouldn't just be a tacit admission that the current MAS is set lower than it would be under CBTC as some kind of a guard against a suicidal T/O, e.g., the guy who is going to clear every yellow-S aspect at maximum speed and then wrap it while trying to generate enough speed to jump two blocks into the rear of the leading train. Otherwise, it's difficult to see why MAS should be set differently based on the signal system in place. If, say, some curve is rated safe only at or below 30 mph, I don't see how using a different signal system is going to make it safe to round that curve at 40 mph. IIRC, I don't think there's any system with rates above 3.2 mphs... PCCs are a classic example of 4 mphps, as I recall, albeit not smoothed, so the rate was practically reduced. Paris a contemporary one, I think, using the smoothing. |
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