Over the past 10 years the geographical circuitry sysem has been developed to meet all the varied requirements of BR traffic. The paper reviews the design of the original system and traces the changes which were made in the light of operating experience. In 1972 the BR provisional Specification was issued, and its requirements were met by further improvements to hardware combined with measures to provide still further flexibility of application. Current developments in circuitry for approach locking, swinging overlaps, and route holding are described.

  • Supplemental Notes:
    • Paper presented to the Institution of Railway Signal Engineers, London, November 5, 1974.
  • Corporate Authors:

    Institution of Railway Signal Engineers

    London,   England 
  • Authors:
    • SMITH, G C
  • Publication Date: 1974-11

Media Info

  • Features: Figures;
  • Pagination: 12 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00095412
  • Record Type: Publication
  • Source Agency: International Railway Documentation, Selection of
  • Files: TRIS
  • Created Date: Jul 15 1975 12:00AM