Double girder bridge cranes feature end trucks that operate on fixed rails attached to the top flange of runway beams or girders. Double girder cranes can provide more lift, because the hoist is placed between the cross girders rather than under them. Therefore, the depth of the cross girder is gained in switching to double girders. Double girder cranes are designed for heavier capacities and often have a continuous duty cycle. These cranes are motorized and typically feature radio controls.