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| Re: Canarsie CBTC (97364) | |||
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Re: Canarsie CBTC |
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Posted by Jeff H. on Sat Jun 11 01:27:16 2005, in response to Re: Canarsie CBTC, posted by Stephen Bauman on Fri Jun 10 07:18:45 2005. That's one of the reasons they have two sets of operating equipment per train. Yes, it will crap out. Yes,it will be a disaster in rush hour. However, current systems using track circuits and vital relays also crap out during rush hour with equally disaterous results. The more recent design philosophy of centralzing everything leads to a higher likelihood of catastrophic failure. The philopsophy of distributed, localized control points tends to isolate the failures to specific places on the railroad. You can get a handful of supervisors down on the roadbed to deal with it and have your rush hour back. Well, you used to be able to do that. Now everyone is afraid to make a decision and get service moving. There are some pretty heavy failure modes in CBTC. What happens when a zone controller crashes, for example. Much of the operating cost savings of CBTC amounts to transferring operating budget to capital budget, which, guess what, eventually comes back into the operating budget as debt service! I'm sure TA CBTC will eventually work, but right now first base (being able to reliably measure train speed and position) is still 90 feet away. |
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