Seaboard W73046
David
It is the type of walkway that shows up on PTX's earlier cars:
https://play.google.com/books/reader?printsec=frontcover&output=reader&id=ZPg4AQAAMAAJ&pg=GBS.RA1-PA849 See also the pair of Ohio Cities tank cars on the bottom of p.135 in Steve Hile's UTLX book. David Thompson
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