 Over the years TM4 has diversified its product range based on the needs of two segments of the transportation industry.Its MOTIVE systems are compact and power dense in order to be integrated into light-duty on and off-road vehicle platforms while the SUMO motors are high torque, direct drive system optimized for buses and commercial vehicles.The Société de transport de Montréal (STM) announced that it would replace the aging fleet of buses with a new family of buses powered by TM4 engine.