was September 30, 1978. Preservation Many RPO cars have been preserved in railroad museums across North America; some of the cars are kept in operational condition. In 1933, Chicago, Burlington and Quincy Railroad rebuilt one of its baggage cars into a replica of the first RPOs that were used on the Hannibal and St. Joseph Railroad in 1862. The railroad displayed the car in several cities along the railroad; it now resides at the Patee House Museum in St. Joseph, Missouri. The Minnesota Transportation Museum (MTM) maintains Northern Pacific #1102, a 1914 Mail RPO, that is classed as a "combine" car, having sections for the RPO, Railway Express Agency and twenty seats for paying passengers. Currently, it is the only Railway Post Office car known to be operational and currently certified for operation on commercial rail. The Osceola and St Croix Valley Railway (division of MTM/reporting mark MNTX) operates the car as part of its tour line, actually "catching the mail on the fly" as a part of its regular runs. As part of the 40th anniversary of the end of RPO service, Minnesota Transportation Museum will be placing #1102 on display at Saint Paul Union Depot as part of its "Last Mail Train" for National Train Day, 6 May 2017. At the end of the day, Great Northern 400, Northern Pacific Railway RPO #1102 and two coaches will be departing Union Depot as Train #1 bound for Osceola, Wisconsin. It will be hauling commemorative envelopes and cards to be sent all across the United States, following which it will operate in regular service as part of the Museum operations out of Osceola, WI. Steamtown National Historic Site in Scranton, PA has RPO car #1100, Louisville & Nashville, on display. It is an all-steel car built in 1914 by the American Car and Foundry Company. The Oil Creek and Titusville Railroad operates a post office car and all mail posted there gets an official USPS OC&T postmark. See also Boat railway post office Catcher pouch Mail bag Mail hook Mail pouch Mail sack Mobile post office Owney (dog) Post Office sorting van Railway mail service library SNCF TGV La Poste French Post Office dedicated TGV sets Terminal railway post office Transfer office Travelling post office — the term for cars in British use that served similar functions. Notes References Citations Sources Johnson, Peter. (1995) Mail by Rail – The History