Note: Marks ending in U are for container owners; marks ending in X are not common carriers; marks ending in Z are for trailers without flanged wheels. All other marks are of common-carrier railroads.
Kansas City Southern (KCS) was a transportation holding company with railroad investments in the United States, Mexico, and Panama that existed from 1887 to 2023. The KCS rail network included about 7,299 miles (11,747 km) of track in the U.S. and Mexico.
The Association of American Railroads (AAR) is an industry trade group representing primarily the major freight railroads of North America. Amtrak and some regional commuter railroads are also members. Smaller freight railroads are typically represented by the American Short Line and Regional Railroad Association (ASLRRA), although some smaller railroads and railroad holding companies are also members of the AAR. The AAR also has two associate programs, and most associates are suppliers to the railroad industry.
Union Pacific Corporation is a publicly traded railroad holding company. It was incorporated in Utah in 1969 and is headquartered in Omaha, Nebraska. It is the parent company of the current, Delaware-registered, form of the Union Pacific Railroad, and the company, along with Berkshire Hathaway-owned rival BNSF, has a near-duopoly on freight railroad transportation west of the Mississippi River.
CSX Corporation is an American holding company focused on rail transportation and real estate in North America, among other industries. The company was established in 1980 as part of the Chessie System and Seaboard Coast Line Industries merger. The various railroads of the former Chessie System and Seaboard Coast Line Industries that are now owned by CSX Corporation were eventually merged into a single line in 1986 and it became known as CSX Transportation. CSX Corporation currently has a number of subsidiaries beyond CSX Transportation. Previously based in Richmond, Virginia after the merger, the corporation moved its headquarters to Jacksonville, Florida, in 2003. CSX is a Fortune 500 company.
The Cedar Rapids and Iowa City Railway, also known as the CRANDIC, is a Class III railroad operating in the US state of Iowa.
Carrizo Gorge Railway, Inc. was a railroad operator on the San Diego and Arizona Eastern Railway (SD&AE) from Tijuana, Mexico, to Plaster City, California.
The Mark Twain Zephyr was an early diesel four-unit articulated zephyr train that was similar to the Pioneer Zephyr in style. The train was built by the Budd Company and was powered by a diesel engine produced by the Winton Engine Company. The train was named after the renowned author Mark Twain because it was scheduled to provide service from St. Louis, Missouri to Burlington, Iowa via his hometown Hannibal, Missouri. The train's exterior structure used stainless steel, and had a "shovel nose" front.
The Adirondack Railroad is a heritage railway serving the Adirondack Park that operates over former New York Central Railroad trackage between Utica and Tupper Lake. The railroad is operated by the not-for-profit Adirondack Railroad Preservation Society, with train crews composed largely of volunteers.
Rio Grande Industries was a name of two holding companies that were involved in the railroading industry. The original and second company took part in the operations of the Denver and Rio Grande Western Railroad and the Southern Pacific Transportation Company.
The New Hope Railroad, formerly and colloquially known as the New Hope and Ivyland Railroad, is a shortline and heritage railroad located in New Hope, Pennsylvania. Today, the railroad operates both steam and diesel powered locomotives and is an associate member of NORAC.
Genesee & Wyoming Inc. (G&W) is an American short line railroad holding company, that owns or maintains an interest in 122 railroads in the United States, Canada, Belgium, Netherlands, Poland, and the United Kingdom; and formerly in Australia.
The Keokuk Junction Railway Co., is a Class III railroad in the U.S. states of Illinois and Iowa. It is a subsidiary of Pioneer Railcorp.
One Rail Australia was an Australian rail freight operator company. Founded by a United States short line railroad holding company, Genesee & Wyoming Inc, in 1997 as Australian Southern Railroad, and successively renamed Australian Railroad Group and Genesee & Wyoming Australia, it was renamed One Rail Australia in February 2020 after the American company sold its remaining shareholding. In July 2022, assets from the South Australian, Northern Territory and interstate operations of the company were sold to rail operator company Aurizon Holdings Limited. The remaining assets, relating to coal haulage in New South Wales and Queensland, were sold in February 2023 to Magnetic Rail Group.
Pan Am Southern, LLC is a freight railroad jointly owned by Norfolk Southern Railway (NS) and CSX Corporation. PAS is independently operated by the Berkshire and Eastern Railroad, a subsidiary of Genesee & Wyoming. PAS owns trackage known as the Patriot Corridor between Albany, New York, and the Boston, Massachusetts, area, utilizing rail lines formerly owned by the Fitchburg Railroad and later on the Boston and Maine Railroad. It was previously operated by PAR subsidiary Springfield Terminal Railway.
Railinc Corporation provides rail data and messaging services to the North American freight railway industry. Railinc is a for-profit subsidiary of the Association of American Railroads.
The Central Maine and Québec Railway was a Class II freight railroad operating in the U.S. states of Maine and Vermont and the Canadian province of Quebec with headquarters in Bangor, Maine. It was owned by Railroad Acquisition Holdings, LLC, a subsidiary of Fortress Investment Group, LLC. It is now a subsidiary of Canadian Pacific Railway since June 2020.