Maryland Area Regional Commuter
Reporting mark: MARC
Amtrak - B&P Tunnels (Baltimore County, Maryland)
Built 1873Tunnel under Baltimore, MD on Amtrak Northeast CorridorOpen to traffic
Amtrak - Gunpowder River Bridge (Baltimore County, Maryland)
Built 1912-13 one track at a time to replace wooden pile trestleGirder bridge over Gunpowder River on Amtrak RR ( 2 tracks)Open to rail traffic, draw mechanism removed
Amtrak - Union Tunnel (Baltimore, Maryland)
First tunnel begun 1866, opened 1873; second bore completed 1934Tunnel on Amtrak (former Penn Central/PRR)Open to traffic