Wikipedia:POTD column/October 17, 2006

Carts have many different shapes but the basic idea of transporting material (or maintaining a collection of materials in a portable fashion) remains. Carts usually have two or four wheels. Those with four wheels (also known as drays or wagons) will often have a pivoting front axle that has a pole connected to the collars or yoke of the two guiding draught animals.

Photo credit: Fir0002
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