A power train assembly having an H-drive configuration is described as having a number of transversely disposed components which transmit drive power from a transversely mounted drive power source to a transversely disposed rear wheel axle via a longitudinally disposed propeller shaft and a conventional axle-mounted differential. The H-drive configuration is ideally suited for use in low floor buses due to its longitudinally compact dimensions, and the resulting significant manufacturing and operating advantages are described. The H-drive configuration takes drive power source torque developed along a vehicle transverse axis, and after a direction changing, folded back arrangement applies the drive torque or power through a right angle gear box to the longitudinal propeller shaft for conventional coupling into the differential.