Missouri Pacific has installed five Automatic Car Identification scanner/decoders at Dupo, Illinois. Four of the scanners are located on the double track main line, bracketing the yard, and one is on the TRRA interchange track. All movements into or out of the yard are captured. The Sylvania units are equipped with 500 label buffer core storage, piggyback format control, message generator and calendar clock. The clock is battery fed. Carrier Indexes are on order. Transmission from the scanner sites is via 100 wpm teletype over leased lines to Model 28 ROTR paper tape punches at the yard office. Either printed copy or punched cards may be reproduced from the paper tape. Dupo was selected because it provided a high volume of rail traffic, could make good use of the ACI data, was easily accessible, and was typical of other terminals. About 50 percent of the cars passing the scanners are labeled, and almost 96 percent of the labels yield correct output. Problems have been noted with labels, particularly on certain types of cars. Two scanners are activated by crossing gate circuits, two by audio frequency overlay, and the interchange scanner by style C track circuits. Planning beyond the Dupo installation is continuing.

  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    P.O. Box 350
    Bristol, CT  United States  06010
  • Publication Date: 1970-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00041141
  • Record Type: Publication
  • Source Agency: Railway Signaling and Communications
  • Files: TRIS
  • Created Date: Mar 23 1973 12:00AM