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Re: TA is obsessed with CBTC, and ''New'' tech for no reason.

Posted by Stephen Bauman on Sat Mar 1 15:39:44 2008, in response to Re: TA is obsessed with CBTC, and ''New'' tech for no reason., posted by trainsarefun on Sat Mar 1 13:24:38 2008.

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I suppose that I might be comparing apples to oranges,

I believe you are. The signal system is designed to avoid collisions. My measurements indicated that the follower will always have a green aspect even with 90 second headways and 30 second dwell times.

If a follower leaves 90 seconds after the leader and follows the exact same speed profile, then the follower will arrive at any point along the route exactly 90 seconds after the leader. It's the function of train supervision to insure that both leader and follower maintain the same speed profile and departing headway not the signal system.

NYCT hasn't had much train supervision. Holding lights are not really up to the task. Both Paris and Moscow have pioneered the use of elegant and inexpensive train supervision systems that track and correct trains down to the second.

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