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Positive train control apparatus

  • US 9,937,938 B2
  • Filed: 08/03/2016
  • Issued: 04/10/2018
  • Est. Priority Date: 08/05/2014
  • Status: Active Grant
First Claim
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1. A positive train control unit for a track way comprising:

  • an elongated member attached at a first end to a first rail of a track way and having a second end;

    a probe near the second end of said elongated member at a predetermined distance from the first end thereof;

    a sensor device attached to a second rail of the track way, the second end of said elongated member extending into said sensor device,said sensor device including a position sensor for sensing the position of said probe, said position sensor including;

    a surface having a pattern thereon wherein the surface pattern defines positions in one dimension or in two dimensions relative to said sensor device;

    wherein said probe near the second end of said elongated member and the surface pattern of said position sensor cooperate to determine the position of said probe relative to the surface pattern, and thereby to determine the position of said elongated member relative to said sensor device;

    whereby said probe of said elongated member and the surface pattern of said position sensor cooperate to define the position of the first rail relative to the second rail.

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