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A system or method of connecting and operating two inductionmotors so that the primary circuit of one is connected to thesecondary circuit of the other, the primary circuit of the latterbeing connected to the source of supply; also, a system of electrictraction in which motors so connected are employed. The cascadesystem is also called tandem, or concatenated, system; the connectiona cascade, tandem, or concatenated, connection, or a concatenation;and the control of the motors so obtained a tandem, or concatenation,control. In the cascade system of traction the cascade connection isused for starting and for low speeds up to half speed. For full speedthe short-circuited motor is cut loose from the other motor and iseither left idle or (commonly) connected direct to the line.