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69
Canton & Youngstown covered hoppers for on-line service
which came from American Car & Foundry in 1947 with roller
bearing National B-1 trucks (69).
In the late 1940s through the 1950s, applications of roller
bearings to existing truck designs continued to be relatively
isolated experiments (70 and 71). What apparently tipped
the scales in favor of roller bearing trucks was the construc-
tion, beginning in the late 1950s, of growing numbers of 90
and 100 ton covered hoppers for grain service. On these cars,
four-wheel plain journal trucks were overloaded, and they
were very prone to overheated journals, the dreaded "hot
boxes" which required them to be set out of trains at the ear-
liest opportunity while en route. Roller bearing trucks solved
69: This roller bearing National B-1 truck for was
applied to covered hoppers built by AC&F for captive
service on the Akron, Canton & Youngstown. The
side frames had pedestal jaws into which the Timken
bearings were fitted.
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