track pump control lever
track drive pump adjustment
track drive pump case drain oil
track drive pump displacement
track drive pump neutral start switch
track drive pump suction line
track drive pump swashplate
engineering district；maintenance of way section；track division；track district；track maintenance division
sodium pump (=sodium-potassium pump =Na-K pump)
jointless line；continuously welded rail track；jointless track
non-NTDS track {dummy track}
replacing and laying track with track panel