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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.
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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.
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