Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

time required to stop a train from full speed is
11' . V f /d = (4/3)V f , (5.28)
where T d is in seconds. The distance traveled in such a deceleration
is given by
where D d is in feet.
2 2 2
A d = (1/2)dT d = V f /2d = (2/3)V f , (5.29)
The deceleration figures produced by Equations (5.27) and (5.2S)
are likely to be overestimates of actual deceleration time and dis-
tance. This observation is based on actual braking tests reported
in Hay. 12 The tests were performed on a train consisting of fifty
70-ton freight cars pulled by four 2,000-horsepower locomotives.
The distance traveled in stopping from 60 miles per hour on various
grades ranged . from about 900 feet to 1350 feet; the time required to
stop varied from 20 seconds to about 28 seconds. Unless one were
concerned with short trips involving many stops or slow-downs, it
scams safe to omit calculations of deceleration times and distances
in determining the time required to make a trip.
Rail Linchaul Delays
Introduction. In the general form of the process function of
a transport mode, there is a term to represent the time during which
the unit is stopped. Sac Equations (3.8) - (3.10). In the case of
barge tows, it was found convenient to disaggregate total delay time
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