A marine diesel anchor windlass is a type of anchor windlass that is powered by a diesel engine. It is usually used on larger vessels, such as commercial ships, to raise and lower anchors, as well as to control the movement of the vessel. A marine diesel anchor windlass consists of a capstan drum that is connected to the diesel engine through a power transmission system. The capstan drum is used to wind up the cable or chain used to raise and lower anchors. A braking system is also included to control the speed and direction of the cable or chain. There are two main types based on the number of anchor wheels: single anchor wheel windlass and double anchor wheel windlass.