A model train locomotive has a set of drive wheels and a power system for rotating the drive wheels. The power system comprises an electric motor mounted for rotating a power input shaft, a control mechanism for regulating the amount of electric current supply to the motor for varying the rotational speed of the power input shaft, and power transmission assembly for transmitting power from the power input shaft to rotate a driven output shaft which is coupled to rotate the locomotive drive wheels. The power transmission assembly includes a flywheel and gear train for rotating the flywheel about an axis of rotation when the electric motor is rotating the power input shaft while the driven output shaft is not rotating. The gear train is effective to rotate the driven output shaft while the flywheel is rotating without stalling the electric motor when the control mechanism increases the amount of electric current supplied to the motor to increase the rotational speed of the power input shaft and rotate the locomotive drive wheels.