Front Runner Intermodal Car with Trailer - UNION PACIFIC - O Scale. In the late 1950s, the intermodal car changed the way railways transported freight by piggybacking trailers on railcars. Our model is based on the lightweight Front Runner Intermodal Car produced by TTX, beginning in 1984. It was able to carry a fully loaded 40' to 48' trailer due to its single-spine construction. This realistically detailed Front Runner with removable Trailer is ready to deliver product straight from the rails to the road. Features include: die-cast body with plastic detail parts, die-cast operating trucks, navigates O-42 curves, removable trailer with operating door, operating couplers, car length 15"; car height 4.75"with trailer, 2" high without trailer.