up-storage-mail-carhttps://www.trains.com/ctr/photos-videos/photo-of-the-day/up-storage-mail-car/UP storage mail car | Classic Trains MagazineClassic Trains magazine celebrates the 'golden years of railroading' including the North American railroad scene from the late 1920s to the late 1970s. Giant steam locomotives, colorful streamliners, great passenger trains, passenger terminals, timeworn railroad cabooses, recollections of railroaders and train-watchers.https://www.trains.com/wp-content/uploads/2020/10/20171129.jpgInStockUSD1.001.00photo-of-the-dayphotos-videosarticleCTR2021-01-052017-11-1044146
Union Pacific No. 5702 was assigned and lettered as a mail storage car. Built by ACF in 1949, it was a long (85-foot) streamlined lightweight car riding on six-wheel trucks.
Union Pacific photo