The problem is now being solved by the installation of hot-box detectors situated at strategic points beside the track and susceptible to any overheated box on a train passing at speed; they report the occurrence automatically to a controller or other operating officer. There is one detector on each side of the line and if there is an overheated box on one side or the other it is picked up by the detector on that side. The heat signal imposed on the telephone lines is instantaneously transmitted from the detector to the control office. Two separate Harmon F.M. carrier channels are provided, one reporting from each detector. The respective frequencies are 40 kcs. and 55 kcs. Any abnormal temperature is indicated to the controller on a graph, and he arranges for the train to be stopped by a special signal five miles after it has passed the detectors and for a maintenance call-light to be switched on. The train crew answering the call is informed of the position on the train of the heated journal, and decides whether the vehicle involved must be cut off.

  • Corporate Authors:

    Temple Press Limited

    161-166 Fleet Street
    Longon EC4,   England 
  • Publication Date: 1960-5-13

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Filing Info

  • Accession Number: 00039675
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM