DF4型接触网放线车 Model DF4 OCS unrolling car
Model DF4 OCS unrolling car is a special vehicle for catenary setting and stretching of electrified railway. It has no power. During operation, it is connected with OCS working car to form the working car group and can be used for erection, routine maintenance and accident rescue operations of the catenary and carrying cable. During catenary setting and stretching, it can cause the wire and carrying cable to produce certain setting and stretching tension, and the catenary and carrying cable can be raised and supported to their respective required height by using the platform.