Washington Union Station in the context of "Interstate 695 (District of Columbia)"

Greyhound Lines, Inc. is an American operator of intercity bus services. Greyhound operates the largest intercity bus network in the United States, and also operates charter and Amtrak Thruway services, as well as intercity buses in Mexico. Based in Dallas, Texas, Greyhound is a subsidiary of Flix SE [de], owner of FlixBus. Greyhound serves over 1,600 American destinations. The company's first route began in Hibbing, Minnesota, in 1914 and the company adopted the Greyhound name in 1929.

This is a list of the busiest Amtrak stations in the United States ranked by their respective Amtrak ridership by fiscal year. Ridership is defined as the total number of boarding and alightings at each station. Ridership figures since 2015 have been provided for comparative purposes. In the fiscal year 2020, ridership was down significantly across the board due to the impact of the COVID-19 pandemic. Ridership numbers are for Amtrak only—commuter rail, subway, and other modes are not included.

The National Railroad Passenger Corporation, doing business as Amtrak (/ˈæmtræk/; reporting marks AMTK, AMTZ), is the national passenger railroad company of the United States. It operates intercity rail service in every contiguous U.S. state except for Wyoming and South Dakota as well as in three Canadian provinces. Amtrak is a portmanteau of the words America and track.

Founded in 1971 as a quasi-public corporation to operate many U.S. passenger rail routes, Amtrak receives a combination of state and federal subsidies but is managed as a for-profit organization. The company's headquarters is located one block west of Union Station in Washington, D.C. Amtrak is headed by a Board of Directors, two of whom are the secretary of transportation and chief executive officer (CEO) of Amtrak, while the other eight members are nominated to serve a term of five years.

Daniel Hudson Burnham FAIA (September 4, 1846 – June 1, 1912) was an American architect and urban designer. A proponent of the Beaux-Arts movement, he may have been "the most successful power broker the American architectural profession has ever produced."

A successful Chicago architect, he was selected as Director of Works for the 1892–93 World's Columbian Exposition, colloquially referred to as "The White City". He had prominent roles in the creation of master plans for the development of a number of cities, including the Plan of Chicago, and plans for Manila, Baguio and downtown Washington, D.C. He also designed several famous buildings, including a number of notable skyscrapers in Chicago, the Flatiron Building of triangular shape in New York City, Washington Union Station in Washington D.C., London's Selfridges department store, and San Francisco's Merchants Exchange.