TM 55-203
Figure 5-1. Typical welded-steel underframe.
Section II. UNDERFRAMES FOR CARS USED IN THEATERS OF
OPERATION
at a 34 1/2-inch coupler height as well as the European
5-5. General
hook-and-link coupler or the Willison coupler at a 41-
One of the basic developmental requirements of the
inch coupler height. The change in ,coupler height is
oversea fleet was a flatcar underframe upon which
accomplished by the use of collars between bolster
satisfactory superstructures for boxcars, high-side and
center plates and shims at the side bearings of both the
body and truck bolsters. Design load limits are fixed at
easily and economically assembled in the field and then
34,000 pounds per axle based on use of 5- by 9-inch
used in service with a minimum of maintenance. The
axles.
40-ton oversea flatcar with its underframe truss-rod
features is built to take the standard automatic coupler
5-2
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