Harness racing use a standing start. The sulky (informally known as a "bike") is a light, two-wheeled cart equipped with bicycle wheels. The driver (not a "jockey", as in thoroughbred racing) carries a light whip chiefly used to signal the horse by tapping and to make noise by striking the sulky shaft. There are strict rules as to how and how much the whip may be used; in some jurisdictions (like Norway), whips are forbidden. For exercising or training, the drivers use what is known as a "jog cart," which is a sulky that is heavier and bulkier than a racing unit.
K-3 cart buzzers, batteries, flags, field glasses and other equipment used by field companies of the Signal Corps. The rear signal cart may be detached from the reel cart and the former used alone in laying and recovering wire. The pintle type wagon is drawn by four horses. The signal cart chest can be moved forward and backward to adjust weight on the horses' necks". K-3 cart The K-3 cart is a 2-wheel, strongly constructed wire cart, similar to artillery caissons, but equipped for carrying and reeling out wire; used together with Signal cart, type K-4, to form the wagon formerly called