The Placid series was a fleet of ten lightweight streamlined sleeping cars built by Pullman-Standard for the Union Pacific Railroad in 1956.

Amtrak acquired all ten from the Union Pacific and operated them into the 1980s; it retired the last in 1996.

[4] Amtrak acquired all ten cars from the Union Pacific in 1971 and operated them through the 1970s; all but one were retired by 1981.

The remainder, Placid Scene, it converted from steam heating to head end power (HEP) in 1984 as part of its Heritage Fleet program, part of a pool of nine 11-bedroom sleeping cars.

[5] In 1996 Amtrak sold it to American Orient Express, who renamed it Grand Canyon.