trackbed道床trackn.轨道；跑道；踪迹；小路；乐曲v.追踪；跟踪track-side scanner线路旁扫描器Track control system跟踪控制系统track structure type轨道结构型式tracking laser radar跟踪激光雷达tracking coordinates跟踪坐标Tracking error pulse滞留脉冲track inspection car轨道检查车tracking angle error随纹角误差Track Radar Test Set跟踪雷达试验装置tracking and control测控