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33-34: 50-ton and 70-ton versions of the National B-1
truck, a unique self-aligning truck which first eliminated
the heavy steel spring plank. National B-1s were widely
used by many railroads from the early 1930s through the
early 1950s.
34
National B-1 trucks
A much more successful innovation was the National Type
B-1 truck, introduced in 1931 by the National Malleable and
Steel Castings Co. (33 and 34). The bolster and side frames of
index contents