环行道的高速试验是在小半径， 大超高， 大欠超高下进行的， 有着其特殊意义。在线路整正的过程中， 使用了大型养路机械， 并针对大型养路机械的特点， 采用多遍作业以消除轨道几何尺寸偏差， 平轨及打磨以消除轨道短波不平顺； 线路开通后， 一次提速达到２００ ｋｍ ·ｈ－ １。试验运行表明， 对轨道几何公差控制是适宜的， 接触网改造也是成功的。 The high-speed test of the roundabout is carried out under the conditions of a small radius, a large height and a large under-height, and has its special significance. In line alignment process, the use of large-scale maintenance machinery, and for the characteristics of large-scale maintenance machinery, the use of multi-pass operation to eliminate track geometry deviation, flat and grinding to eliminate short-track orbit irregularities; line opened, a speed Reaching 200 km · h-1. The test run shows that it is suitable for track geometric tolerance control and the catenary reconstruction is also successful.