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Re: Real Long Read On NYCPropulsion/Braking

Posted by Jeff H. on Sun Nov 5 00:16:18 2006, in response to Re: Real Long Read On NYCPropulsion/Braking, posted by H.S.Relay on Sat Nov 4 20:50:04 2006.

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There's also a big difference depending on how one calculates
the "emergency brake rate". All NYCT equipment creates and
maintains a cylinder pressure during emergency which is constant
for the duration of the stop (as opposed to, e.g. the WABCO
"High-Speed" automatic air brake system used in high-speed passenger
rail earlier in the century in which emergency applications came
on hard and then bled down). The coefficient of friction with cast
iron shoes increases as speed decreases. Therefore the curve
of brake rate vs speed or vs time is not a constant line. With
composition shoes the curve is flatter.

Is the emergency brake rate quoted the minimum, maximum or average?

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