Proportion of HPa/HPb/HPc/HPd hopper rebuilds

[NW Mailing List]

Dear List,

During the HP hopper rebuilding program of 1923-32, how many HP cars were
rebuilt into each of the HPa, HPb, HPc, and HPd subclasses? Were there any
cars that persisted as unrebuilt HP cars? I am trying to understand the
relative prevalence of each of these subclasses in the immediate
pre-Depression (1929) era. Thanks for any help on this matter.

Dan Miller
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