Stringent electronic checks are built into audiofrequency track circuits recently installed by South African Railways on ac and dc electrified lines in an attempt to prevent maloperation by traction harmonics, even when thyristor or chopper control is used. Once techniques for protecting complex switches and crossings have been fully developed so that the need for block joints is eliminated altogether, neither the electric traction designer nor the permanent way engineer will be constrained by signalling requirements.

  • Availability:
  • Corporate Authors:

    IPC Transport Press, Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 
  • Authors:
    • Moorey, E
  • Publication Date: 1978-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00188097
  • Record Type: Publication
  • Source Agency: International Union of Railways
  • Files: TRIS
  • Created Date: Feb 27 1979 12:00AM