MONITORING SYSTEM FOR RAILWAY TRACK LAYING AND MAINTENANCE
1306506 Track positioning F PLASSER 22 Jan 1970 [22 Jan 1969] 3216/70 Heading B7N [Also in Division E1] In a railway track processing system in which, e.g. an old track is replaced or the ballast of a track is lifted and cleaned, the position of the new or processed track is determined by reference to a datum line or plane defined by the position of the old or unprocessed track. In the track replacing arrangement shown, in which a leading train loads the old track sleepers and supplies new rail 2 and a second train picks up the old rails, the last vehicle of the leading train carries a transmitter 7 directing a laser beam to the first vehicle 13 of the second train which carries track aligning tools 11 controlled by the beam signal picked up by receiver 10. The beam direction is determined by wheels 4, 5 of the vehicle 1 which are forced into engagement, by, e.g., an hydraulic ram 9, with a rail of the old track.