The PRR built 2900 G31 class gondolas at Altoona between 1948-1951. In 1951-52, the PRR also began building gondolas in subclasses G31A through G31E, which had wood floors instead of steel. Some cars in the G31D class were built with covers, extended sides and covers, or fitted with skids and hoods for steel coil service (as were some G31E cars). Rebuilds of G31 through G31E classes yielded the G31F - G31M classes.

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