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Transmitting loop arrangement for railroad cab signal and speed control system

  • US 4,026,506 A
  • Filed: 08/31/1976
  • Issued: 05/31/1977
  • Est. Priority Date: 08/31/1976
  • Status: Expired due to Term
First Claim
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1. A loop arrangement for transmitting cab signal controls to a vehicle, provided with cab signal apparatus, traversing a stretch of fixed roadway divided into a plurality of sections, comprising in each section the combination of,(a) a first transmitting loop extending parallel to and within the section roadway generally along a first predetermined alignment but with an offset portion of preselected length at the section exit end positioned on a second predetermined alignment,(b) a second loop of the same preselected length as said offset portion of said first loop positioned at the exit end parallel to and within the section roadway along said first predetermined alignment,(c) a cab signal transmitter means at the exit end coupled to said first loop and responsive to advance traffic conditions along said stretch for transmitting into said first loop a selected one of a plurality of cab signal commands in accordance with the location of the next preceding vehicle,(d) said cab signal transmitter means also coupled to said second loop for transmitting the same commands but responsive to the occupancy condition of the adjoining advance section for interrupting the transmission of cab signal commands when said adjoining advance section is occupied by a vehicle,(e) a first cab signal pick-up means on each vehicle traversing the stretch positioned to respond to a loop signal in each loop positioned along said first predetermined alignment and coupled for actuating the associated cab signal apparatus to a movement control condition when a signal is present and to a cut-off condition when a signal is absent in such loop, and(f) a second cab signal pick-up means on each vehicle positioned to respond to a signal in said offset portion of said first loop and coupled for resetting said associated cab signal apparatus from said cut-off condition to an active condition only when a proceed cab signal command is received from that loop.

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