flight track data Creation
Flight Track Management
four-dimensional flight track
generating criterion flight track of target
whole course flight track
engineering district；maintenance of way section；track division；track district；track maintenance division
Flight-by-Flight Spectrum
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