Cool Lego tractor with trailer! By turning the gearwheel on top of the tractor its possible to steer the front wheels. When tractor is pushed forward or backwards the 4 pistons in the engine will move!The engine hood can also be opened, and the lifting arms on back of tractor can be raised and lowered by turning gear wheel on back of tractor. Transmission axel on back of tractor can rotate when model is pushed forward or backward, and this function can be turned on and off on the right side