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The NDT includes railway operating supplies which must be programmed
for movement the same as the supplies of any other service. The NDT
is computed separately for each division of rail line; it is
determined by multiplying the net trainload by the train density.
For example, if the NTL for a division is 383 STON and the TD is 17,
the estimated NDT is 6,511 STON:
383 x 17 = 6,511
However, this estimate is valid only if all 17 trains are freight
trains. If other types of trains such as passenger, troop, or
hospital trains are used, they will replace an equal number of
freight trains. When the operation of such trains is anticipated,
allowance in the NDT estimates is made by adjusting the TD of the
division. For example, if 4 passenger trains are scheduled for this
division, or if their need is anticipated, the estimated NDT is
adjusted by multiplying 383 by 13, since you would be running only 13
freight trains. The adjusted NDT is 4,979 short tons.
2.16. END DELIVERY TONNAGE
The final step in rail line capacity determination, and the
estimation you as a planner have been trying to make, is end delivery
tonnage (EDT). The EDT is the number of short tons of through
freight that can be delivered at the end of the rail line (railhead)
each day. This determination is most important to the planner,
because it is this freight that supports the combat forces in the
forward areas of a theater. In an allrail movement, where freight
is delivered exclusively by rail, the EDT is the same as the net
division tonnage (NDT) of the most restrictive division of the entire
railroad. For example, if the NTL for each division of a three
division railroad is 383 short tons and the train densities are 10,
9, and 11, the NDT's are 3,830, 3,447, and 4,213 respectively. The
EDT for this railroad is 3,447 short tons. The second division is
the most restrictive because it has the lowest train density9.
2.17. EXAMPLE OF RAILWAY LINE CAPACITY DETERMINATION
For a practical application of the information found in this
chapter, an example is presented of how to determine the tonnage
capacity of a hypothetical threedivision, singletrack, standard
gage rail line in a theater of operations. Extending from a port to
a railhead, it has a port terminal, two division terminals, and an
unloading terminal at the railhead. Assume that you are the planner,
and you have the following intelligence information about each of the
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