The Pacific series is a fleet of fifty lightweight streamlined sleeping cars built by the Budd Company for the Union Pacific Railroad in 1949–1950. Each car contained ten roomettes and six double bedrooms. Union Pacific sold several to the Chicago, Milwaukee, St. Paul and Pacific Railroad (the "Milwaukee Road") in the late 1960s; Amtrak purchased most of the fleet in the early 1970s. Several remain in use as business cars.