Very interesting (and encouraging), thanks for posting the link.
US practice was to cast the loco bed complete with cylinders as a single unitary part, and virtually all (if not all) of the American superpower...
Since it is -possible to design a spring which does exactly what is required when lubricated, and utterly impossible to predict how it will...
Only Mk1 corridor stock had Buckeyes, non-corridor suburban stock did not.
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