Until opening of the Victoria Line, train descriptions on London Transport railways had been initiated by signalmen or, latterly, by programme machines. These stages of development are described in an historical introduction, leading to a review of the Identra system used on the Victoria Line in which descriptions are set by the train operator in the cab and recognized by lineside equipment. Experience has shown the need for more information than can be conveyed by a code of eight frequencies and so a new system is under development in which a 40-bit message will carry train numbers and crew duty roster numbers as well as train destination. The paper describes the prototype installation of a Positive Train Identification (P.T.I.) system developed by London Transport which is being made on the District Line between Putney Bridge and Earls Court. It concludes with an examination of future design possibilities in areas such as information display techniques and integration of P.T.I. with on-line computer control.

  • Corporate Authors:

    Institution of Railway Signal Engineers

    London,   England 
  • Authors:
    • Hurford, N S
  • Publication Date: 1974-10-2

Media Info

  • Pagination: 12 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00083925
  • Record Type: Publication
  • Source Agency: British Railways
  • Files: TRIS
  • Created Date: Jul 2 1975 12:00AM