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. It was named for the commonwealth in which it was established. At its peak in 1882, the Pennsylvania Railroad was the largest railroad, the largest transportation enterprise, and the largest corporation in the world.
The Western Maryland Railway was an American Class I railroad (1852–1983) that operated in Maryland, West Virginia, and Pennsylvania. It was primarily a coal hauling and freight railroad, with a small passenger train operation.
The Southwest Pennsylvania Railroad is a shortline railroad that operates in southwestern Pennsylvania. The SWP uses rail branches that were acquired from CSX Transportation and Conrail. All of the track used by the SWP is in either Fayette or Westmoreland counties. SWP provides local service to many customers in the area, connecting them to the outside world via interchanges with Norfolk Southern, Wheeling & Lake Erie Railroad, and CSX. SWP has been vital in the location of several new industries to Fayette and Westmoreland Counties in recent years.
The Wheeling and Lake Erie Railway is a Class II regional railroad that provides freight service, mainly in the areas of Northern Ohio and Western Pennsylvania. It took its name from the former Wheeling and Lake Erie Railway, most of which it bought from the Norfolk and Western Railway in 1990.
The Pittsburgh and West Virginia Railway was a railroad in the Pittsburgh, Pennsylvania, and Wheeling, West Virginia, areas. Originally built as the Wabash Pittsburgh Terminal Railway, a Pittsburgh extension of George J. Gould's Wabash Railroad, the venture entered receivership in 1908, and the line was cut loose. An extension completed in 1931 connected it to the Western Maryland Railway at Connellsville, Pennsylvania, forming part of the Alphabet Route, a coalition of independent lines between the Northeastern United States and the Midwest. It was leased by the Norfolk and Western Railway in 1964 in conjunction with the N&W acquiring several other sections of the former Alphabet Route but was leased to the new spinoff Wheeling and Lake Erie Railway in 1990, just months before the N&W was merged into the Norfolk Southern Railway.
The Montour Trail is a multi-use recreational rail trail near Pittsburgh, Pennsylvania. It was formerly the Montour Railroad.
The Buffalo and Pittsburgh Railroad is a Class II railroad operating in New York and Pennsylvania.
The Glenwood B&O Railroad Bridge is a truss bridge in Pittsburgh, Pennsylvania, which carries Allegheny Valley Railroad's W&P Subdivision over the Monongahela River.
A large metropolitan area that is surrounded by rivers and hills, Pittsburgh has an infrastructure system that has been built out over the years to include roads, tunnels, bridges, railroads, inclines, bike paths, and stairways; however, the hills and rivers still form many barriers to transportation within the city.
Union Railroad is a Class III switching railroad located in Allegheny County in Western Pennsylvania. The company is owned by Transtar, Inc., which is a subsidiary of Fortress Transportation and Infrastructure Investors, after being acquired from U.S. Steel in 2021. The railroad's primary customers are the three plants of the USS Mon Valley Works, the USS Edgar Thomson Steel Works, the USS Irvin Works and the USS Clairton Works.
The Keystone Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. states of Maryland and Pennsylvania. The line runs from Cumberland, Maryland, west to McKeesport, Pennsylvania, along a former Baltimore and Ohio Railroad (B&O) line. The line includes the well-known Sand Patch Grade over the Allegheny Mountains.
The CL&W Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of Ohio. The line runs from a junction with the New Castle Subdivision at Sterling northwest to Lorain along a former Baltimore and Ohio Rail Road line. It junctions with the Cleveland Subdivision at Lester and the Greenwich Subdivision at Grafton.
The P&W Subdivision is a railroad line owned and operated by CSX Transportation, the Allegheny Valley Railroad (AVR), and the Buffalo and Pittsburgh Railroad (BPRR) in the U.S. state of Pennsylvania. The line runs from Rankin north through Pittsburgh to West Pittsburg along a former Baltimore and Ohio Railroad line, once the Pittsburgh and Western Railroad.
The Pittsburgh Subdivision is an American railroad line that is owned and operated by CSX Transportation in the Commonwealth of Pennsylvania.
The Allegheny Valley Railroad is a class III railroad that operates in Western Pennsylvania, and is owned by Carload Express, Inc.
The 33rd Street Railroad Bridge is a truss bridge that carries the Allegheny Valley Railroad on the P&W Subdivision over the Allegheny River that connects downtown Pittsburgh, Pennsylvania to Herrs Island, Pittsburgh, United States.
Sand Patch Grade is an approximately 100-mile-long (160 km) section of railroad track known for its steep grades and curves through the Allegheny Mountains of Pennsylvania and western Maryland. Dropping over 1,000 feet (300 m) in about 20 miles (32 km) and with grades as much as 2%, Sand Patch Grade is one of the steepest railroad grades on the East Coast.
The Brilliant Branch, also known as the Brilliant Cutoff, is a railway line in Pittsburgh and Aspinwall, Pennsylvania. It connects the Pittsburgh Line to the Conemaugh Line and to Allegheny Valley Railroad's Allegheny Subdivision.
