Bogie Structures of Speed-Rising Freight Cars

The structures and properties of Z8AG, Z8G and ZK2 bogies, as well as the problems often encountered in their operation, are analyzed. It is pointed out that the traditional three-piece bogies cannot be applied to the speed-rising of freight cars. The bogies suitable for the purpose must meet the following basic demands: the maximum running speed is at least 120 to 130 km/h, and the wearing rate and wheel/ rail contact stresses should not be larger than those of the traditional bogies.