The HTM13 Epicyclic Gear Train is training equipment designed for the laboratory demonstration of the gear system. It is a wall-mounted unit consisting of a two-stage epicyclic gear train with sun, planet, and ring gears for each stage. The equipment allows students to experimentally investigate the torque ratios, gear ratios, efficiencies, velocity ratios of gear trains. It can be operated in a variety of modes to allow observation of ratios with different combinations of the position of different parts between the two gears. A comprehensive instruction manual supplied with the equipment helps the operator to perform experimental setup and procedure.