Safe operation of the subway train comes to the orderly operation of people's normal life and the city. As soon as the subway train traveled fault occurs mechanical parts, such as wheel bearings burning, killed gears, gear boxes and other suspension failure, the train will not be pulling out of the scene on their own or passive, can cause paralysis of the subway line. Subway train special wheel trailer carrying vehicles are able to walk the line portion of the train after a failure, the failure to hold the wheel, the trailer containing the fault of the carrier vehicle Wheel, quickly train off the scene of the accident fault and resume normal operations. A subway train car carrying relief is characteristic for subway lines and vehicles specially designed compact and lightweight, removable flexible bogie wheel temporary replacement device for the subway train rescue. Such as in the event of a wheel of the truck can not move, rescue workers immediately use the car carrying the rescue, the failure to hold the wheel, replace the wheel is rotated by a rescue car, train evacuated as soon as possible so that failure to quickly restore the running subway lines. The main components: three hydraulic jacking cylinders, pumps, wheel of the carrier frame, wheel pairs. How it works: electric passenger vehicle axle locking occurs, when the fault can not be normal driving wheel of the carrier vehicle will be towed to the emergency vehicle fault line, can quickly complete transport vehicle quickly clear the fault line. The main technical parameters: speed ≤10Km / h Axle ≤15000Kg The product is mainly used in Beijing subway, MTR Corporation, Nanchang, Zhuhai, Guangzhou, Huai'an