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SWITCH CONTROL ARRANGEMENT FOR RAILROAD CLASSIFICATION YARDS

  • US 3,736,420 A
  • Filed: 09/13/1971
  • Issued: 05/29/1973
  • Est. Priority Date: 09/13/1971
  • Status: Expired due to Term
First Claim
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1. A control arrangement for a track switch in a railroad classification yard, comprising in combination, a. a switch movement means operable to move said track switch between two opposite positions to establish a first or a second route for cars traversing said switch, b. an automatic control means for said yard for selecting a switch position to establish the desired route for each car scheduled to traverse said switch, 1. said automatic control means jointly controlled by the entry of a particular car into said yard and the passage of that car at said switch for detecting when that car has completed its passage of a preselected point at said switch. c. a position selection means controlled by said automatic control means and connected for controlling said switch movement means to move said track switch to the selected position for an approaching car, d. a first inhibit means jointly controlled by said automatic control means and by the movement of a car over said track switch and connected for interrupting the control of said switch movement means by said position selection means when a car is traversing said switch, and e. a second inhibit means operable to block a selected one of the two routes over said switch to car movement and connected when so operated for interrupting the control of said switch movement means by said position selection means to establish said blocked route.

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