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Piggyback transportation refers to the transportation of goods where one transportation unit is carried on the back of something else. It is a specialised form of intermodal transportation and combined transport .
Trailer on flatcar, also known as TOFC or piggyback, is the practice of carrying semi-trailers on railroad flatcars. TOFC allows for shippers to move truckloads long distances more cheaply than can be done by having each trailer towed by a truck, since one train can carry more than 100 trailers at once. [ 1 ]
Truck trailers were first carried by railway before World War II, an arrangement often called "piggyback", by the small Class I railroad, the Chicago Great Western in 1936. The Canadian Pacific Railway was a pioneer in piggyback transport, becoming the first major North American railway to introduce the service in 1952. In the United Kingdom ...
A Trailer-on-flat-car, or piggy-back car allows two 28.5-foot (8.69 m) trailer pups or one semi-trailer up to 57 feet (17.37 m) to be carried. Like well cars, these usually come in articulated sets of five or three. A longer TOFC (trailer on flat car) is usually an 89 ft (27.13 m) car.
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Flat wagons for piggyback services Class Type 1 with four axles, short Type 2 with four axles, long Type 4 with six axles Type 1 Pocket wagon Type 2 Kangourou wagon [5] Type 3 Wippenwagen; Class Sg[kk]mmss Sgjkkmmss Sgss Sgjss Saggrss Skss since 1980: Sdkms Skss Saass Pivot pitch 10.75 m 35 ft 3 + 1 ⁄ 4 in 11.30 m 37 ft 7 ⁄ 8 in 14.60 m