CSX Transportation in the context of "Pikeville Cut-Through"

The Maryland Area Rail Commuter (MARC) is a commuter rail system in the Washington–Baltimore area. MARC (reporting mark 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 2024, the system had a ridership of 4,187,100, or about 19,300 per weekday as of the third quarter of 2025, less than pre-COVID-19 pandemic weekday ridership of 40,000.

With trains on the Penn Line reaching a maximum speed of 125 miles per hour (201 km/h), MARC has the highest top speed of any commuter railroad in the United States.

The Norfolk Southern Railway (reporting mark NS) is a Class I freight railroad operating in the Eastern United States. Headquartered in Atlanta, the company was formed in 1982 with the merger of the Norfolk and Western Railway and Southern Railway. The company operates 19,420 route miles (31,250 km) in 22 eastern states and the District of Columbia, and has rights in Canada over the Albany to Montreal route of the Canadian Pacific Kansas City. Norfolk Southern Railway is the leading subsidiary of the Norfolk Southern Corporation.

Norfolk Southern maintains 28,300 miles of track, with the rest managed by other parties through trackage rights. Intermodal containers and trailers are the most common commodity type carried by NS, which have grown as the coal business has declined throughout the 21st century; coal was formerly the largest traffic source. The railway offers the largest intermodal rail network in eastern North America. NS was also the pioneer of Roadrailer service. Norfolk Southern and its chief competitor, CSX Transportation, have a duopoly on the transcontinental freight rail lines in the Eastern United States.

Conrail Shared Assets Operations (CSAO) is the commonly used name for modern-day Conrail (reporting mark CRCX), an American railroad company. It operates three networks, the North Jersey, South Jersey/Philadelphia, and Detroit Shared Assets Areas, where it serves as a contract local carrier and switching company for its owners, CSX Transportation and the Norfolk Southern Railway. When most of the former Conrail's track was split between these two railroads, the three shared assets areas (a total of about 1,200 miles of track) were kept separate to avoid giving one railroad an advantage in those areas. The company operates using its own employees and infrastructure but owns no equipment outside MOW equipment.

The Western & Atlantic Railroad of the State of Georgia (reporting mark W&A) is a railroad owned by the State of Georgia and currently leased by CSX, which CSX operates in the Southeastern United States from Atlanta, Georgia, to Chattanooga, Tennessee.

It was founded on December 21, 1836. The city of Atlanta was founded as the terminus of the W&A, with the terminus marked with the Atlanta Zero Mile Post. The line is still owned by the State of Georgia from Atlanta to CT Tower in Chattanooga; it is leased by CSX Transportation.

The Atlantic Coast Line Railroad (reporting mark ACL) was a United States Class I railroad formed in 1900, though predecessor railroads had used the ACL brand since 1871. In 1967, it merged with long-time rival Seaboard Air Line Railroad to form the Seaboard Coast Line Railroad. Much of the original ACL network has been part of CSX Transportation since 1986.

The Atlantic Coast Line served the Southeast, with a concentration of lines in Florida. Numerous named passenger trains were operated by the railroad for Florida-bound tourists, with the Atlantic Coast Line contributing significantly to Florida's economic development in the first half of the 20th century.

The 14th Street bridges are a set of adjacent five road and rail bridges that cross the Potomac River, connecting Arlington, Virginia and Washington, D.C. A major gateway for automotive, bicycle and rail traffic, the bridge complex is named for 14th Street (U.S. Route 1), which feeds automotive traffic into it on the D.C. end.

The complex contains three four-lane automobile bridges—including, from west to east, one southbound, one bi-directional, and one northbound—that carry Interstate 395 (I-395) and U.S. Route 1 (US 1) traffic, as well as a bicycle and pedestrian lane on the southbound bridge. In addition, the complex contains two rail bridges, one of which carries the Yellow Line of the Washington Metro; the other of which, the only mainline rail crossing of the Potomac River to Virginia, carries a CSX Transportation rail line. The five bridges, from west to east are the George Mason Memorial Bridge, the Rochambeau Bridge, the Arland D. Williams, Jr. Memorial Bridge, the Charles R. Fenwick Bridge and the Long Bridge. In aerial photos, shadows caused by a large, concrete divider on the bi-directional Rochambeau Bridge create the illusion of two, two-lane bridges, but this is in fact, a single, four-lane structure.

Railroad classes are the system by which freight railroads are designated in the United States. Railroads are assigned to Class I, II or III according to annual revenue criteria originally set by the Surface Transportation Board in 1992. With annual adjustments for inflation, the 2019 thresholds were US$504,803,294 for Class I carriers and US$40,384,263 for Class II carriers. (Smaller carriers were Class III by default.)

There are six Class I freight railroad companies in the United States: BNSF Railway, CSX Transportation, Canadian National Railway, CPKC, Norfolk Southern Railway, and Union Pacific Railroad. Canadian National also operates in Canada and CPKC operates in Canada and Mexico.