| Starting 
                  in 1953 Southern Pacific® started Trailer-On-Flat-Car or 
                  TOFC service. This service was also know as Piggyback as trailers 
                  were placed onto flatcars and transported along rails. These 
                  flatcars were originally flat deck cars but were later modified 
                  in order to be used as TOFC cars. The 40ft trailers featured 
                  as the load on these cars entered into service in the 1960's. |