This car was built as a 44 seat coach for the Union Pacific Railroad in 1961. Conveyed to Amtrak in 1971 and numbered 4450, the car operated for several years as a coach having been converted to HEP from Steam Heat in August 1980 and renumbered 4630. The car was converted into a Baggage/Mail car in 1997 with the interior gutted and the windows plated over with a single sliding door installed in the center of the car on each side. With this conversion, the car was renumbered to 1731. The car did retain its original vestibule on one end however the steps that fold out for access to the vestibule on most cars have been replaced by small foot ladders (for crew access) as these cars don't have passengers boarding from them any longer. Historical Information about this car provided by www.amtrakbythenumbers.com.