https://industrialscenery.blogspot.com/2026/03/1904-4350-1326m-abanwestern-maryland.html
Industrial History: 1904 4,350' (1,326m) Aban/Western Maryland Indigo Tunnel and C&O Canal Lock...
West Portal: ( Satellite ) East Portal: ( Satellite ) Josephh , Aug 2024 Western Maryland evidently prefered timber lined tunnels because th...