Boxcar Brake Wheel Location

Allen Cain

When would the brake wheel on boxcars and reefers have been changed from a vertical shaft with the brake wheel located above the roof to the horizontal shaft with the brake wheel located on the end of the car at the top?

Was there a rule prohibiting the earlier version in interchange service and if so, when was the cut off date.

If not regulated, did the location get changed by the car owners over the years or did they retain the earlier configuration for the life of the car?
Allen Cain
Modeling the Southern in 1955 in HO Scale

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