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To load vehicles on the top deck of a double-decker commercial trailer, the rear half of the deck can tilt and be lowered hydraulically, forming a drive-up ramp to the upper deck. The top deck is usually loaded first and off-loaded last since the presence of cars on the lower deck can make it impossible to lower the top deck ramp.
In 1959, when 85 ft (25.91 m) flat cars capable of carrying two 40-foot (12.19 m) highway trailers in trailer-on-flatcar (TOFC), or "piggyback" service were introduced, new automobiles began to be shipped by rail loaded on highway auto-carrier trailers. Eight to ten autos could be carried per flat car in this manner.
A typical lowboy load configuration. A lowboy (low-loader in British English, low-bed in western Canada and South Africa or float in Australia and eastern Canada) is a semi-trailer with two drops in deck height: one right after the gooseneck and one right before the wheels. This allows the deck to be extremely low compared with other trailers.
A container chassis, also called intermodal chassis or skeletal trailer, is a type of semi-trailer designed to securely carry an intermodal container. Chassis are used by truckers to deliver containers between ports , railyards, container depots, and shipper facilities, [ 1 ] : 2–3 and are thus a key part of the intermodal supply chain .
One example is trailer creep (also known as trailer walk, or dock walk), which occurs when the lateral and vertical forces exerted each time a forklift truck enters and exits the trailer cause the trailer to slowly move away from the dock, resulting in separation from the dock leveler. Factors that affect trailer creep are the weight and speed ...
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