The Maine Central still had some into the 70's even after rebuilding with plywood sides:
http://www.fototime.com/ftweb/bin/ft.dll/detailfs?userid={91CE877C-F16C-43EE-A91F-EDF166979869}&ndx=2&slideshow=0&AlbumId={957D9D39-0081-4D22-97F5-60B1BF9843E2}&GroupId={B96B6463-65EE-4CFB-BCF7-2B40694DEBA8}&screenheight=1152
or metal sides:
http://www.fototime.com/ftweb/bin/ft.dll/detailfs?userid={91CE877C-F16C-43EE-A91F-EDF166979869}&ndx=30&slideshow=0&AlbumId={957D9D39-0081-4D22-97F5-60B1BF9843E2}&GroupId={B96B6463-65EE-4CFB-BCF7-2B40694DEBA8}&screenheight=1152
Rich Gibson
Tulsa
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