The rate of rail creep lengthening is not the same at the different time after the new raillaying on the track.
得出新钢轨上道后的不同时期，其蠕变伸长速率是不同的。
2
The rate of rail creep lengthening at the beginning after raillaying on the track is greater than that of the afterward time.
新钢轨上道后的前期，蠕变伸长速率较大，以后逐步降低。
3
During raillaying, the loop part of the U-shaped bent loop is knocked bent to hold down the foot of the rail and in this way, the sleeper and the rail are connected together.