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Posted by Stephen Bauman on Sun Jun 22 20:34:06 2003, in response to Re: Flushing Line to B Division?,
posted by AlM on Sun Jun 22 19:47:50 2003.
Why the extra 6000 feet of margin for error? I could understand 1000 extra feet. But 6000 feet?
Trains are operating on a headway of 90 seconds (40 tph). An observer is at a fixed point. The first train comes along at time T = 0 and continues travelling at 75 ft/sec. The second train comes to the same point 90 seconds later (T = 90). How far has the first train travelled?
s = v x t = 75 ft/sec x 90 sec = 6750 ft.
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