engineering district；maintenance of way section；track division；track district；track maintenance division
elliptical fin-elliptical tube
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
anisotropic medium elliptical sphere
approximate elliptical cross section pressure vessel
backward elliptical vibrating forces
Balanced Elliptical Motion
Bending elliptical mirror
Complete elliptical integral
composite elliptical plates