CTA operations on the loop require selective routing of trains at Tower 12. Northbound moves are over a trailing point switch and automatic interlocking is simple. Southbound moves are over a facing point switch and routing information must be provided to the interlocking system. Lake-Dan Ryan trains require the facing point switch to be lined normal. Loop Shuttle trains and Evanston trains require the facing point switch to be lined reverse. A WABCO laser ACI system is used to provide routing information for the forty southbound trains each hour. To minimize labeling costs, only Lake-Dan Ryan train cars are labeled. Detection of a label provides for the interlocking system to line the switch normal. Presence of a train with no label detection provides for the switch to be lined reverse. At the present time, only routing information is used, but plans are completed to transmit car number data to CTA headquarters where maintenance scheduling data can be compiled. To reduce vandalism, labels are mounted on folding doors which are turned inward so that the label is inside the car when the car is at the loading platform. If an incorrect route is established, or no route, the train must stop and the motorman must push a selector lever. The ACI label and system used are not the system approved by the AAR for railroads.

  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    P.O. Box 350
    Bristol, CT  United States  06010
  • Publication Date: 1971-9

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 12-14
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00041046
  • Record Type: Publication
  • Source Agency: Railway System Controls
  • Files: TRIS
  • Created Date: Mar 9 1973 12:00AM