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| Re: Old LIRR Rockaway Beach Branch (1253056) | |||
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Re: Old LIRR Rockaway Beach Branch |
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Posted by Stephen Bauman on Sat Oct 12 06:48:07 2013, in response to Re: Old LIRR Rockaway Beach Branch, posted by Andrew Saucci on Fri Oct 11 18:45:55 2013. The trains could be stored on an extra platform or two, or perhaps on tail tracks.That would destroy the purpose of the tail tracks. That is an area where CBTC could perhaps improve performance by introducing a measure of consistency into operations; presumably, part of CBTC would be to hold trains to the schedule as best as possible all along the route. Padding the schedule means you need more trainsets for a given service level. NYCT solved this problem by reducing service levels. The given metric for determining on time performance is terminal arrival time. This is what both NYCT and its T/O's are judged. Both NYCT and its T/O's have figured out how to game the system. What you need is a different metric for on time performance that includes intermediate points as well as terminal arrival. What you are describing is Train Supervision rather than Train Control. NYCT has never had anything but rudimentary train supervision in the form of manually operated holding lights. There are Automatic Train Supervision (ATS) modules as part of CBTC installations. Howerver, ATS does not require CBTC or any other train control system. Inexpensive ATS's are currently used in other systems to achieve 35+ tph. NYCT's sole effort at ATS - the timers at Grand Central on the Lex express - are designed to accentuate schedule deviations. |
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