Towing (shunting) Carriage: The towing carriage moves on the outer side of the track on a guide made of two channel sections. The railroad cars (wagons) are caught and released automatically by gripping arms that catch the rims of car wheels. UT-7 towing carriage is designed for moving groups of railroad cars with the total weight of up top 2,000 t.
Drive Station: The main component of the drive station is a motor-planetary gear assembly, supported on a steel frame and used to drive the towing carriage with ropes as the 'driving medium' and a hydraulic power unit with a cylinder, designed to provide and maintain the necessary tension of the towing ropes, depending on the operating status of the drive station.
Return Station: It is a set of two wheels: interlacing and directional.
Limit Sensors System: At both ends of the operating length of the towing carriage induction sensors are mounted to determine the allowed final positions of the carriage. As an emergency device, mechanical limit switches are installed behind them to cut off the power supply and stop the carriage if the limit sensors should fail. The system is equipped with an anti-overload protection.
Signalling System: There is a sound and optical emitting device installed at the rail track.
Operation and Control: The railroad car puller is stared and operated from a control panel and - optionally - with a remote controller. Individual functions are controlled with buttons and switches. The correct tension of the rope is monitored with a controlled located in an RS automatic control box. When the railroad car puller is started the system determines the correct operating pressure in the hydraulic cylinder and monitors oil parameters and the status of frequency inverters. If allowed by secondary devices the gripping arms will be extended (to catch a wheel rim of the car) or retracted (to release the car) and the carriage will be move separately or coupled with the group of railroad cars.