where
CTL = gross trailing load
DBP = drawbar pull
W = weather factor
RR = rolling resistance
GR = grade resistance
CR = curve resistance
NOTE: Throughout this text, raise all computations resulting in
fractions to the next higher whole number.
If trains are doubleheaded or if pushers are used, the GTL is
equal to the sum of the GTL's for all locomotives used multiplied by
90 percent for steam locomotives and 100 percent for dieselelectric
locomotives. Double heading means coupling two or more locomotives
to the head end of a train; pushers are one or more locomotives
coupled at the rear end of the train. An example demonstrating how
to find GTL is presented in the next main paragraph; it is essential
in determining the net trainload, net division tonnage, and end
delivery tonnage, discussed later in the text.
2.11. EXAMPLE OF GTL DETERMINATION
You are going to operate a railway division of 100 miles in a
theater of operations during the winter. You have the following
information about the railroad, and you wish to use it to determine
GTL.
Locomotives 0660 dieselelectrics, each with a total
weight of 240, 000 pounds (120 tons), a starting
tractive effort of 72,000 pounds, and a
continuous tractive effort of 36,000 pounds
Weather
Cold, with lowest temperatures ranging between
11 and 20 F.
Trackage
Singletrack, standard gage, fair to poor
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