Abstract: A power drive system for road vehicles comprises, in series relationship, at least a prime motor, at least a hydraulic pump driven by the prime motor and at least one hydraulic motor connected to the hydraulic pump and driving a differential gear interposed between the hydraulic motor and a respective pair of driving wheels.

Abstract: A carriage body structure for public transportation vehicles, having two sides comprising a latticework of uprights and stringers supporting each a sidewall longeron member whereto a respective roof longeron member is rigidly connected. The roof longeron members form the base members for the roof of the carriage body structure. The roof structure further comprises arcuated crossbeams connected with and extending between the roof longeron members, and wide elongated covering sectional members resting on the crossbeams and extending in the direction of the roof longeron members.

Abstract: A light alloy body structure particularly for transport vehicles, including a top structure and said structures fixed along longitudinal edges of the top structure extending transverse thereto. At each of the two longitudinal edges of the top structure of the vehicle a composite longeron member is provided having a curved cross-section. The longeron member consists of two mating elongated shaped members rigidly connected to each other along longitudinally extending mating surfaces thereof and connecting the top structures with the respective side structure of the body structure of the vehicle.