Ohio & Baltimore Shortline Railway
Reporting mark: O&BSL
AVR - Whitehall Tunnel (Allegheny County, Pennsylvania)
Built 1899Tunnel on Allegheny Valley RailroadOpen to traffic
O&BSL - Dunbar Creek Bridge (Fayette County, Pennsylvania)
Mostly removed and abandoned deck truss bridge over Dunbar Creek on RailroadMostly removed and abandoned