Abstract: Disclosed is a system of energy storage and electrical motorization to be installed on a towed car of a convoy. The system includes an energy storage module having the capacity to receive energy, to accumulate the energy over time and to restore the energy upon request in electrical form; a motor/generator transforming electrical energy into mechanical energy and vice versa. An acceleration detector is configured to generate a first signal, the first signal indicating an acceleration undergone by the car. A controller establishes for establishing commands and provides control signals to different system components according to the first signal energy storage module accumulating or restoring the energy to the electrical converter. The controller is configured to cause the motor/generator to progressively apply a tractive force in response to the first signal, the tractive force being an increasing function of the acceleration indicated by the first signal.