The Superliner railcar entered revenue service with Amtrak.

The Superliner is a type of bilevel intercity railroad passenger car used by Amtrak, the national rail passenger carrier in the United States. Amtrak commissioned the cars to replace older single-level cars on its long-distance trains in the Western United States. The design was based on the Budd Hi-Level cars used by the Santa Fe Railway on its El Capitan trains. Pullman-Standard built 284 cars, known as Superliner I, from 1975 to 1981; Bombardier Transportation built 195, known as Superliner II, from 1991 to 1996. The Superliner I cars were the last passenger cars built by Pullman.

The National Railroad Passenger Corporation, doing business as Amtrak, 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 three Canadian provinces. Amtrak is a portmanteau of the words America and track.