The track is constantly exposed to vertical and lateral deformation
under repeated loading by trains. Periodic measurement of the
resulting track displacement (track irregularity) and adequate repair
are vital to ensure riding comfort and running safety. To meet this
requirement, a track inspection train is effectively utilized.
Inspection of track displacement on the Shinkansen line is carried out
by the track inspection car incorporated in the trainset of electric and
track inspection train. "Doctor Yellow" having been used so far (Fig.
1) is based on the three-bogie inspection system and the maximum
speed has been 210 km per hour according to the running
performance.
In