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63: This 90-ton truck, built in the early 1920s and
essentially of Andrews design, had very large journal
boxes and side frame extensions to support the
outboard brake rigging for clasp brakes.
64: Used under a 90-ton drop center flat car, this
truck looked like an ARA standard truck on steroids.
Although the design was essentially the same, its
journal boxes were huge and the side frame and
bolster castings had much heavier sections than on a
truck of less capacity.
64
65
Freight Car Trucks - 23
66
65: With articulated side frames for better weight
distribution, this Buckeye six-wheel truck had a
nominal capacity of 100-tons (i.e., a pair of them
could support a hundred-ton load).
66: Drawing from passenger car truck practice,
Commonwealth produced this heavy-duty six-wheel
freight car truck with drop equalizers.
67: When even six-wheel trucks weren't enough to
support a car's intended capacity, it was possible to
put two four-wheel trucks under each end, with each
pair connected by a massive span bolster. In this
case, the trucks were Dalman Two Level.
67
however, it was not until advances were made in roller bearing
technology in the 1930s and, especially, during World War II
that roller bearings became available which were more suitable
for use on railroad cars.
index contents
MRH-May 2013