K Brake rebuilding to AB brakes on tank cars after 1954 bans


As I understand it, K brakes were banned in interchange on tank cars
as of October 1, 1953 and had a final ban (returning cars)by January
1, 1954.

Is there evidence that there was a large scale rebuilding of tank cars
to equip them with AB brakes at this time or were many of the cars
scrapped then?

Was there any "grace" period?

By 1954-55 should I expect to be running only AB equipped tank cars
(since interchanged privately owned cars predominate)?


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