Work in progress: Superliners 

The Superliner is a double decker passenger car used by Amtrak on long haul trains that do not use the Northeast Corridor. The initial cars were built by Pullman-Standard in the late 1970s and a second order was built in the mid 1990s by Bombardier Transportation. . As delivered, the cars came in various configurations, including coach, diner, and sleeper.

Source: Wikipedia (http://en.wikipedia.org/wiki/Superliner_%28railcar%29)