Abstract: A vehicle, particularly a semitrailer, is adapted for driving on both a road and a railroad track. The semitrailer includes a traction vehicle, which is joined articulately to a trailer. The traction vehicle has a front rail-wheel unit and a rear rail-wheel unit, whereas the trailer includes only one rear rail-wheel unit. At least one of the two latter rail-wheel units includes drive means, and one or both of said units may consist of a bogie that includes two axles, or one or both of said units may be a single-axle unit. All rail-wheel units are vertically movable to enable the vehicle to be placed on the railroad and adjacent rubber wheel to be lifted.

Abstract: A mobile working platform, particularly a so-called under-bridge lift, comprising a parallelogram type boom which is horizontally and vertically pivoted to a vehicle and which at its end facing away from the vehicle has a turntable which is rotatable by means of a hydraulic motor and at its circumference supports the angular end of an inner arm which is vertically pivotable by means of a piston and cylinder assembly which is mounted adjacent to the circumference of the turntable approximately diametrically opposite the mounting point of the inner arm. By means of a hydraulic cylinder, the inner arm is vertically pivoted to an intermediate arm which by means of a further hydraulic cylinder is vertically pivoted to an outer arm which vertically pivotally supports a platform or cage. Between the turntable and the platform or cage, motion transfer means in the form of rods and chains extend to keep the platform or cage in a horizontal position independently of the angle of inclination of the boom and arms.