engineering district；maintenance of way section；track division；track district；track maintenance division
jointless line；continuously welded rail track；jointless track
non-NTDS track {dummy track}
replacing and laying track with track panel
track-to-track association
track-to-track moving time
transforming single track into double track
double - track existing single track line
Ⅰ-type slab ballastless track
2 dimension tissue track
25 Hz phase detecting track circuit
25Hz phase detecting track circuit
Ⅱ slab ballastless track