The trend toward higher voltages for power transmission lines and the trend toward locating such power lines along railroad rights-of-way have caused increasing problems for railroad signal and communications facilities. These trends demand maximum protection against hazardous induced voltages and possible fault currents that can endanger personnel and affect signal systems. The most effective means of avoiding interference is sufficient separation between power lines and signal circuits. When separation is not practical, shielding may be used. When a power line parallels the railroad, the power line current magnetically induces a voltage in the rails. The major factor is earth return currents, power line earth return currents may enter the roadbed and rails even when the power line is not closely parallel to the railroad.

  • Supplemental Notes:
    • This report was given at the 1972 meeting of Communication & Signal Section, AAR's Special Committee on Inductive Interference.
  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    P.O. Box 350
    Bristol, CT  United States  06010
  • Publication Date: 1972-12

Media Info

  • Features: Photos;
  • Pagination: p. 22-23
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00041127
  • Record Type: Publication
  • Source Agency: Railway System Controls
  • Files: TRIS
  • Created Date: Mar 23 1973 12:00AM