关键词: 换轨车；换轨原理；钢轨收放装置； &ldquo, 天窗&rdquo, 时间

Abstract: In order to realize replacements of railroad tracks for the high-speed railways automatic ally, the principles of rail-changing operations and key technologies were studied，which targeted on the rapid rail-changing vehicles of high-speed railways by self-wheeling operation . And the performances of the railcar were verified through the application tests of the rapid rail-changing vehicles by self-wheeling operation. The research results show that， compared with the traditional rail changing operations using simple implements or modified vehicles, the rapid rail-changing vehicles by self-wheeling operation may save the “sky-light” time about 20 minutes under the 2 km operation volume, and the maximum daily rail change mileages may reach 2.4 km. This new vehicle is more efficient, safer and low operating intensity.

Key words: rail-changing vehicle, principle of rail-changing, track retracting and releasing device； “sky-light&rdquo, time