Wag'on, the name given a four-wheeled vehicle used for carrying merchandise. Wagons are constructed of a great variety of patterns, the body being adapted to the particular use for which the vehicle is intended. Farm wagons usually have long rectangular boxes, so made that they can be taken off or put on the gear at will Most of these wagons can also have the running-gear extended or shortened, to suit the purpose for which the wagon is needed. Road wagons have a light running-gear, springs and upholstered seats. Some of them contain seats which can be placed upon the body. These seats are usually mounted upon steel springs. See CARRIAGE.