double winch bridge cranes for use in loading smelting furnaces. main hook capacity 50 t auxiliary hook capacity 10 t hook lift 12 m. gauge (track width) 28 m hoisting speed 12 m/min. trolley speed 30 m/min. bridge glide ......double winch bridge cranes for use in loading smelting furnaces. main hook capacity 50 t auxiliary hook capacity 10 t hook lift 12 m. gauge (track width) 28 m hoisting speed 12 m/min. trolley speed 30 m/min. bridge glide speed 60 m/min class a7 m7.