After improving, the failure dolly could be operated remotely from the ground, hence reduced the maintenance work and increased running efficiency and safety.

• 增加红外遥控操作功能后,利用手持红外遥控器维修人员在地面上就可以对故障小车进行遥控操作,减轻了维修工作量,提高了设备有效作业率,增加了操作的安全性。