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Re: Left Behind by the Nationís Largest Subway System

Posted by Stephen Bauman on Mon Jan 1 21:32:08 2018, in response to Re: Left Behind by the Nationís Largest Subway System, posted by Bill from Maspeth on Mon Jan 1 18:22:11 2018.

Let's assume the leader is stalled on the block just past the station. The signal at mid platform will be red with the tripper up. The signal at the station entrance will be yellow.

Suppose a T/O decides to ignore the yellow and go through the station at full throttle (55 mph). The mid station tripper will put the follower into emergency 300 feet from the leader. Stopping distance from 55 mph at 3 mph/sec is 756 feet - ouch!!

Train has to be moving less than 35 mph to stop in that distance. However, many station lights are much closer than 300' to the station exit. Also, not all emergency brakes are capable of 3 mph/sec. That's why even 35 mph won't guarantee avoiding a collision.


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