RailGon

Company History: The Railgon Company, established in 1979, owned railroad gondola cars available for use by multiple railroads by placing the cars in a cooperative pool.
Railgon (and the similar Railbox Company) are currently subsidiaries of TTX Company, formerly the Trailer Train Company, which is owned by multiple railroads and leases cars to them.

From Wikipedia

Successor/Parent History: TTX Company (formerly Trailer Train until 1991) is a leading provider of railcars and related freight car management services to the North American rail industry. TTX's pool of railcars (over 220,000 cars and intermodal wells) is ideal for supporting shippers in the intermodal, automotive, paper & forest, metals, machinery, wind energy and other markets where flatcars, boxcars and gondolas are required.

Owned by North America's leading railroads, TTX's free-running pools provide fungible assets that minimize total empty miles, further lowering costs and minimizing risk for the industry, helping the railroads conserve their capital for other critical infrastructure needs. Customers easily recognize TTX's bright yellow cars as a consistent, high quality, well-maintained fleet that serves many transportation needs.

Brief History: The U.S. is a country of 50 states covering a vast swath of North America, with Alaska in the northwest and Hawaii extending the nation’s presence into the Pacific Ocean. Major Atlantic Coast cities are New York, a global finance and culture center, and capital Washington, DC. Midwestern metropolis Chicago is known for influential architecture and on the west coast, Los Angeles' Hollywood is famed for filmmaking.