Re: Unusual center sill

Tim O'Connor

Early AAR 50 ton flats (Union Pacific?) were built with wood stringers. Perhaps some 70 ton cars were also built that way.
I vaguely recall (perhaps incorrectly) that Byron Rose's AAR 50 ton resin flats had the wood stringers. But I could just be
confused. :-

On 1/9/2023 9:00 PM, Mike Clements via wrote:

I was heading there Jack but after seeing this photo I’m not sure. This is a Lot 721-F car. The end flanges seem to sit completely below the deck already, so why go lower in the middle? Note the use of wooden stringers (to conserve steel during the war?).

Tim O'Connor
Sterling, Massachusetts

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