The OML is the route of the first commercial railroad in the USA as it pushed
west from Baltimore, Maryland to the Ohio River.
It was constructed largely by hand between 1828 and 1835, and amazingly, continues
in use even now by CSX.
The B&O Washington Branch (now CSX Capital Subdivision) splits from the
Old Main Line in Relay and extends to Washington, DC.
It was built around 1835, but contains fewer surviving relics than the OML.
The route is busier and less scenic.
The B&O Metropolitan Branch, now CSX Metropolitan Subdivision, starts in Washington, DC and progresses northwest
to Weverton, MD. This tour continues to Harpers Ferry, WV as the Cumberland Subdivision.
Camden Cutoff and Spur
mp 3 to 1.5 - expanded mid-JUL 2021
mp 1.5 to 0 - updated Apr 2020
more expansion - in development Locust Point Branch - updated Mar 2018 South Baltimore Branch - posted Jun 2015
Curtis Bay Branch
mp 4 to 2 west - posted Apr 2015
mp 2 to -2 east - updated Feb 2018
Seawall Branch - updated May 2021
Marley Neck Branch - extending from Curtis Bay Branch
mp 8 to 5 - posted Aug 2015
mp 5 to 3 - posted Sep 2015
mp 3 to 0 - updated Mar 2021
Baltimore Belt Line - including Howard Street Tunnel
mp 96 to 94 Camden to Mount Royal - posted Nov 2016
mp 94 to 93 Jones Falls to Charles Village - updated Jun 2020
mp 93 to 89 Waverly to Bayview - updated Jul 2020
mp 89 to 80 Bayview to White Marsh - updated Nov 2017
mp 78 to 70 Gunpowder to Van Bibber - posted Sep 2017
mp 63 Aberdeen Station - posted Nov 2017
mp 63 to 58 Aberdeen to Susquehanna - posted Jun 2018
Sparrows Point Branch
mp -0 to 1 Bayview to Canton Jct - updated Aug 2018
mp 1 to 5 Canton Jct to Dundalk - posted Apr 2017
mp 5 to 10 Dundalk to Sparrows Point - posted Jun 2017
Pennsylvania Railroad in Maryland
By combining several smaller roads, the Pennsylvania Railroad was able to break the
B&O's monopoly on long-distance rail service from/to Maryland and Washington, DC.