In a message dated 11/11/2005 9:30:22 PM Eastern Standard Time, jabutler@... writes: Please, Forgive my lack of knowledge on this. Does anyone know of an HO flat car suitable for use as a TOFC car to be used with the Classic Metal Works 33 ft. trailers? About when did railroads start putting truck trailers on flat cars? Which railroads did it first? Thanks for any help. Jim B. Forgeting the quality of the car, the Walthers PRR 75' alleged F39 (later the initial TTX cars) were designed for the 32' trailers.