MOBILE TRACK SURFACING APPARATUS

摘要

In a track grading machine, which operates with two reference beams associated with respective rails and wherein the beam stops and receivers are held at a constant distance from the rails, drive motors are provided for automatically adjusting the vertical position of each beam transmitter independently. The drive motors are operated in response to any deviation of the track from the horizontal, taking into account the different between the actual and the desired superelevation.