Amtrak has used a variety of paint schemes (liveries) on its rolling stock since taking over intercity passenger rail service in the United States in 1971. A series of seven schemes termed Phases, first introduced in 1972, have seen the widest use. Phases primarily use geometric arrangements of red, white, and blue—the national colors of the United States—part of Amtrak's patriotic visual identity.
Amtrak began operations in May 1971 with a mixture of equipment still painted in the distinct colored liveries of the freight railroads that relinquished their passenger service to Amtrak. The company retained the equipment that it determined to be in the best condition, and elected not to keep the same rolling stock on the same routes.