The contour size changes of rail before and after straightening, involving width of railhead, rail height and rail length, were measured. The causes of rail height decrease were analyzed.
测定了矫直前后钢轨外形尺寸变化(包括轨头宽度、轨高、钢轨长度)，分析了轨高减少的原因。
3
The jolt to the streetcar knocked the old man's head against a seat rail and drove Enzo to his knees.