WP 483 was one of 6 cars (481-486) built by the International Car division of Paccar in 1980 as an extension of Southern Pacific's order for C-50-9 cabooses. These were the last steel cabooses built for the Western Pacific (as the C-50-9 cars were for the SP) and were practically new when the UP/WP/MP merger took place in 1982. These cars were classified by UP as CA-18 cars. The 483 wasn't retired until 1988 after being out of service and stored for about a year in Council Bluffs, Iowa. After retirement, Union Pacific generously donated the car to the Western Railway Museum at Rio Vista Junction in Suisun, California. In 2006 the car was involved in a trade with the Western Pacific Railroad Museum in Portola, CA where it is now reunited with sister caboose WP 484. Images were taken when the car was at Rio Vista in February, 2002.