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58
58: When it first appeared ca. 1941, the Allied Full
Cushion truck was a revolutionary effort to provide
a better riding high-speed truck for freight cars in
passenger express service. However, its tendency to
derail proved impossible to correct completely, and it
was outlawed in interchange in 1955.
problems, and intensive efforts to cure this shortcoming were
only partly successful, so they were little-used after the war,
and finally were banned in interchange in 1955.
After World War II, the Chrysler Corporation attempted to
improve truck performance by the use of automotive tech-
nology in the Chrysler FR-5 truck (59). This truck had a swing
motion bolster and hydraulic shock absorbers, among other
features, but these innovations did not compensate for its
additional cost and increased maintenance requirements, and
it was not widely adopted.
Heavy-duty trucks
Relatively few freight cars built between 1900 and 1960 had
nominal capacities exceeded 70 tons. However, early in the
20th century some very large coal hoppers and gondolas were
constructed with capacities of up to 100 tons, and those cars
required special high-capacity six wheel trucks. Usually these
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