The Lionel 6-6904 O gauge Union Pacific Extended vision Caboose is a vintage model train car manufactured by Lionel in 1983. This ready-to-go/pre-built caboose features a classic yellow color, accurate representation of the Union Pacific Railroad, and a scale of 1:48. Made of plastic and designed for a three-rail system, this caboose is perfect for collectors and enthusiasts of model railroads and trains. The detailed design and transportation theme make it a must-have for any train layout. On the carton it states limited edition series.  This caboose comes from an estate of a collector of model trains.  My knowledge of model trains is limited.