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| Re: Canarsie CBTC (97579) | |||
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Re: Canarsie CBTC |
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Posted by Stephen Bauman on Sat Jun 11 19:57:11 2005, in response to Re: Canarsie CBTC, posted by RonInBayside on Sat Jun 11 17:02:52 2005. What type of topology, ideally, would you look for when installing RF CBTC?First off, understand that RF CBTC is required for the necessary maintenance savings. The maintenance for Inductive Loop or Leaky Coax are likely to be as high as those for maintaining insulated joints. The real question is retrofitting CBTC onto a system that has evolved over 50+ years. Remember, CBTC and conventional equipment cannot exist over the same track at the same time. The reason was stated earlier, but to reiterate foreign equipment on CBTC track results in operating at the service level of the AWS - 4 tph. Similarly, if OPTO is implemented for CBTC trains, then these trains cannot operate over non-CBTC track in revenue service. They used to operate Canarsie trains over the WB, when there was a block between Myrtle and Broadway Junction. That flexibility will be lost when ATO-OPTO comes to the Canarsie Line. The TA has started reversing trains at Bway-Jct rather than providing direct service to Manhattan for such blockages, just so the unwashed masses don't notice this slight of hand. Think of NYCT's topology, trunks and branches. You will be hard pressed to find isolated lines to retrofit. It's an all or nothing proposition - regardless of whether the existing signal system needs replacement. BTW, the signal system on the Flushing Line was replaced in the early 1950's. It's a lot newer than most mainline systems. It has less need for replacement than most of NYCT'S signals. The retrofit cannot be phased in on an as needed basis. This significantly increases the up front costs for a system as vast as NYCT. Will the savings justify the extra cost of junking serviceable signal systems? Not likely until the cost for CBTC is an order of magnitude less than that for a conventional system. |
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