A tractor for moving semitrailers or trailers in industrial and/or logistic facilities that is devoid of the combustion engine and its gearbox, comprising: a supporting chassis provided with a cab and connected, by virtue of respective suspensions, to a front axle and to a motorized rear axle, at the rear part of said supporting chassis there being an engagement element for a semitrailer to be moved; at least one electric traction motor, which is supported by said supporting chassis and is connected to said rear axle by virtue of kinematic connection means, which are adapted to maintain the transmission of motion between said electric traction motor and said motorized rear axle when the relative position between said rear axle and said supporting chassis varies; wherein said kinematic connection means comprise a Cardan shaft which is connected at a first end to the differential unit formed on the motorized rear axle and at the other end to the output shaft of said electric traction motor with, interposed between said output shaft of said electric traction motor and said second end of said Cardan shaft, a speed reduction unit, wherein said supporting chassis comprises two longitudinal members (2a, 2b), which support a supporting structure of said electric traction motor, respective elastic supports for interconnection being interposed between said longitudinal members (2a, 2b) and said supporting structure, characterised in that, said supporting structure comprising a closed cradle-like structure, which supports said electric traction motor and said speed reduction unit, and wherein said closed cradle-like structure comprises a lower fixing base, onto which said electric traction motor and/or said speed reduction unit are fixed, said lower fixing base being connected, by virtue of respective anchoring posts, to brackets for connection to respective elastic interconnection supports, said closed cradle-like structure comprising at least one upper stiffening cross-member, which connects the upper ends of anchoring posts arranged on opposite sides with respect to the longitudinal extension of said electric traction motor, said elastic interconnection supports being constituted by an anchoring plate fixed to a respective longitudinal member (2a, 2b) and having a peripheral frame which internally accommodates an elastic supporting body, which in turn forms a receptacle for a respective end portion of a connecting bracket, which is jointly connected to the supporting structure. a supporting chassis provided with a cab and connected, by virtue of respective suspensions, to a front axle and to a motorized rear axle, at the rear part of said supporting chassis there being an engagement element for a semitrailer to be moved; at least one electric traction motor, which is supported by said supporting chassis and is connected to said rear axle by virtue of kinematic connection means, which are adapted to maintain the transmission of motion between said electric traction motor and said motorized rear axle when the relative position between said rear axle and said supporting chassis varies; wherein said kinematic connection means comprise a Cardan shaft which is connected at a first end to the differential unit formed on the motorized rear axle and at the other end to the output shaft of said electric traction motor with, interposed between said output shaft of said electric traction motor and said second end of said Cardan shaft, a speed reduction unit,