Everything about Drawbar Haulage totally explained
A
drawbar is a solid
coupling between a hauling vehicle and its hauled load. Drawbars are in common use with road trailers, both large and small, industrial and recreational.
The drawbar shouldn't be confused with the
fifth wheel coupling. The drawbar requires a trailer which either loads the drawbar lightly (for example a small boat trailer, or caravan, where a load of up to ~50 kg is part of correct trailer loading practice), or the load is the weight of the coupling components only (larger trailers, usually but not always with a steerable hauled axle, front or rear). The fifth wheel is designed to transmit a major proportion of the load's weight to the hauling vehicle.
Drawbars are not restricted to road haulage, nor to agricultural or similar use. A
rail locomotive hauls its load through a drawbar and hauling force is transmitted between
rolling stock via drawbars between units.
A drawbar is mounted or located on the tractive vehicle and is used to accept the coupling of the load. The direction of haulage may be push or pull, though pushing tends to be for a pair of
ballast tractors working one pulling and the other pushing an exceptional load on a specialist trailer.
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