Specialty tractor includes a diesel engine coupled with a powertrain including a clutch and a manual shift transmission having an output shaft that is designed to transmits power to the wheels of the tractor. An electric motor includes an output shaft connected through a power transmission to the output shaft of the manual shift transmission. The specialty tractor includes an electronic unit configured to perform at least a first operating mode and a second operating mode. In the first operating mode the clutch is opened and the manual transmission does not receive any torque from the diesel engine, and the electric motor transmits torque to the wheels the tractor. In the second operating mode the clutch is closed and the manual transmission receives torque from the diesel engine so that the engine-torque is transmitted to the wheels of the tractor that moves at a speed higher than the speed limit.