The Baltimore and Ohio Railroad was the first common carrier railroad and the oldest railroad in the United States. It operated as B&O from 1830 until 1987, when it was merged into the Chessie System; its lines are today controlled by CSX Transportation.
The Pennsylvania Railroad, legal name The Pennsylvania Railroad Company, also known as the "Pennsy", was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. At its peak in 1882, the Pennsylvania Railroad was the largest railroad, the largest transportation enterprise, and the largest corporation in the world.
The Maryland Area Rail Commuter (MARC) is a commuter rail system in the Washington–Baltimore area. MARC is administered by the Maryland Transit Administration (MTA) and operated under contract by Alstom and Amtrak on track owned by CSX Transportation (CSXT) and Amtrak. In 2023, the system had a ridership of 3,860,600, or about 14,000 per weekday as of the second quarter of 2024, less than pre-COVID-19 pandemic weekday ridership of 40,000.
The Junction Railroad was a railroad created in 1860 to connect lines west of downtown Philadelphia, Pennsylvania, and allow north-south traffic through the metropolitan area for the first time. The railroad consisted of 3.56 miles of double track and 5.3 miles of sidings. It owned no locomotives or rolling stock. The line connected the Philadelphia and Reading Rail Road line at the west end of the Columbia Bridge over the Schuylkill River, crossed the Pennsylvania Railroad line, ran parallel to Market Street, and turned south to connect with the Philadelphia, Wilmington and Baltimore Railroad at Gray's Ferry.
The Baltimore and Potomac Railroad (B&P) operated from Baltimore, Maryland, southwest to Washington, D.C., from 1872 to 1902. Owned and operated by the Pennsylvania Railroad, it was the second railroad company to connect the nation's capital to the Northeastern U.S., and competed with the older Baltimore and Ohio Railroad.
The Philadelphia, Wilmington and Baltimore Railroad (PW&B) was an American railroad that operated independently from 1836 to 1881. Headquartered in Philadelphia, it was greatly enlarged in 1838 by the merger of four state-chartered railroads in three Mid-Atlantic states to create a single line between Philadelphia and Baltimore.
The Baltimore and Philadelphia Railroad was a railroad line built by the Baltimore and Ohio Railroad (B&O) from Philadelphia, Pennsylvania, to the Maryland-Delaware state line, where it connected with the B&O's Philadelphia Branch to reach Baltimore, Maryland. It was built in the 1880s after the B&O lost access to its previous route to Philadelphia, the Philadelphia, Wilmington and Baltimore Railroad (PW&B). The cost of building the new route, especially the Howard Street Tunnel on the connecting Baltimore Belt Line, led to the B&O's first bankruptcy. Today, the line is used by CSX Transportation for freight trains.
The Northern Central Railway (NCRY) was a Class I Railroad in the United States connecting Baltimore, Maryland, with Sunbury, Pennsylvania, along the Susquehanna River. Completed in 1858, the line came under the control of the Pennsylvania Railroad (PRR) in 1861, when the PRR acquired a controlling interest in the Northern Central's stock to compete with the rival Baltimore and Ohio Railroad (B&O).
The CSX Susquehanna River Bridge is a railroad bridge that carries CSX's Philadelphia Subdivision across the Susquehanna River between Havre de Grace and Perryville, Maryland, via Garrett Island. It was built in 1907-10 by the Baltimore and Ohio Railroad (B&O) on the same alignment as an 1886 B&O bridge. Like its predecessor, it was the longest continuous bridge on the B&O system.
The Baltimore Belt Line was constructed by the Baltimore and Ohio Railroad (B&O) in the early 1890s to connect the railroad's newly constructed line to Philadelphia and New York City/Jersey City with the rest of the railroad at Baltimore, Maryland. It included the Howard Street Tunnel, the Mount Royal Station for B&O's Royal Blue Line passenger trains, and the first mainline railroad electrification in the United States. CSX Transportation currently operates the line as part of its Baltimore Terminal Subdivision.
The Hanover Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. states of Maryland and Pennsylvania. The line runs from Baltimore, Maryland, west to Hagerstown, Maryland, along several former Western Maryland Railway (WM) lines. It meets the Baltimore Terminal Subdivision at its east end, and the Lurgan Subdivision heads both north and west from its west end.
Aberdeen station is a train station in Aberdeen, Maryland, on the Northeast Corridor. It is served by Amtrak Northeast Regional intercity service and MARC Penn Line commuter service. The station has two side platforms serving the outer tracks of the three-track Northeast Corridor, with a station building on the north side of the tracks.
The Philadelphia Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. states of Pennsylvania, Delaware, and Maryland. The line runs from Philadelphia, Pennsylvania, southwest to Baltimore, Maryland, along a former Baltimore and Ohio Railroad (B&O) line.
The Metropolitan Subdivision is a railroad line owned and operated by CSX Transportation in Washington, D.C. and Maryland.The 53-mile line runs from Washington, D.C., northwest to Weverton, Maryland, along the former Metropolitan Branch of the Baltimore and Ohio Railroad.
The Delaware Extension was a rail line owned and operated by the Pennsylvania Railroad in Philadelphia, Pennsylvania.
The Pope's Creek Subdivision is a CSX Transportation railroad line in Maryland, running from Bowie to the Morgantown Generating Station in Morgantown, Maryland. The Herbert Subdivision to the Chalk Point Generating Station connects to it at Brandywine and the Indian Head-White Plains railroad used to connect to it at White Plains. Its name comes from Pope's Creek in Newburg, MD to where it originally ran.
The Bowie Railroad Buildings comprise three small frame structures at the former Bowie train station, located at the junction of what is now the Northeast Corridor and the Pope's Creek Subdivision in the town center of Bowie, Maryland. The complex includes a single-story freight depot, a two-story interlocking tower, and an open passenger shed. The station was served by passenger trains from 1872 until 1989, when it was replaced by Bowie State station nearby. The buildings were restored in 1992 as the Bowie Railroad Museum and added to the National Register of Historic Places in 1998.
The Landover Subdivision is a railroad line owned and operated by CSX Transportation. It runs from the Anacostia section of Washington, D.C., to Landover, Maryland, serving as a freight train bypass of Washington Union Station.
The Alexandria Extension is a short rail line in Washington, D.C. and Prince George's County, Maryland. Its northern portion connects the Capital Subdivision to the RF&P Subdivision, allowing freight trains to avoid Downtown Washington. Its southern portion, the Shepherd Industrial Spur, extends south to Shepherds Landing, directly across the Potomac River from Alexandria, Virginia; service on this portion ended in 2001.
The Philadelphia and Baltimore Central Railroad (P&BC) was a railroad that operated in Pennsylvania and Maryland in the 19th and early 20th centuries. It operated a 110-mile (180 km) main line between West Philadelphia and Octoraro Junction, Maryland, plus several branch lines.
