A system for retarding the speed of a railcar comprises a brake; a hydraulic actuator moving the brake between a closed position in which the brake applies braking pressure on the wheel of a railcar, and an open position in which the brake does not apply braking pressure on the wheel of the railcar; a hydraulic circuit provided with a pump arrangement for supplying hydraulic fluid to the hydraulic actuator; and a control circuit coupled to the hydraulic circuit for controlling the flow of hydraulic fluid to move the brake between the closed and open positions.

A system for retarding the speed of a railcar comprises a brake; a hydraulic actuator moving the brake between a closed position in which the brake applies braking pressure on the wheel of a railcar, and an open position in which the brake does not apply braking pressure on the wheel of the railcar; a hydraulic circuit provided with a pump arrangement for supplying hydraulic fluid to the hydraulic actuator; and a control circuit coupled to the hydraulic circuit for controlling the flow of hydraulic fluid to move the brake between the closed and open positions.

A device for restricting movement of a carriage that is used to convey vehicles and workers in an assembly line in a factory for assembling complete vehicles includes a hold-back device for the carriage which can prevent an accident caused by equipment failure and improves an operating rate by implementing a new conceptual hold-back system which allows a cam roller operated by a cylinder to come into close contact with a side surface of the carriage to rotate in a direction identical to a carriage movement direction, and provides a load to the carriage by using back pressure/discharged air from the cylinder so as to prevent an increase in gap between carriages.

A device for restricting movement of a carriage that is used to convey vehicles and workers in an assembly line in a factory for assembling complete vehicles includes a hold-back device for the carriage which can prevent an accident caused by equipment failure and improves an operating rate by implementing a new conceptual hold-back system which allows a cam roller operated by a cylinder to come into close contact with a side surface of the carriage to rotate in a direction identical to a carriage movement direction, and provides a load to the carriage by using back pressure/discharged air from the cylinder so as to prevent an increase in gap between carriages.