How long did Frisco's USRA Boxcars last with wood sides?

Charlie Duckworth <trduck@...>

Good friend gave me a USRA 40' Frisco Double-sheathed car for the
layout. I was looking through photos and see many were rebuilt with
plywood sides and steel sides. How long did they last with the
original double sheathed sides? My layout cutoff date is 1954.

Thanks - Charlie

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