Current requirements for checking the vigilance of the driver and safeguarding operation, if this falls below an accepted standard, make it clear that two safeguard functions are essential: to provide an effective deadman operation, and to check constantly that the driver is alert. Very recently a completely fresh design approach was made to the way the equipment can be made to fulfill the operating requirements and which lends itself to a much cheaper first cost, a very great reduction in maintenance, and is readily adaptable to fitting to locomotives without or with deadman equipment. The approach has been to provide a completely electronic unit incorporating relatively recently devised equipment, the metallised polycarbonate capacitor which has an infinitely small leakage characteristic and is used as the delay element, and the uni-junction transister which fires off the circuit operation when the voltage in the capacitor reaches a predetermined value. Incorporation of safety and vigilance cycles into the one control circuit provides a compact and straightforward arrangement which does not require the driver to choose between two courses of action to prevent a brake application once he hears the bell.

  • Corporate Authors:

    Temple Press Limited

    161-166 Fleet Street
    Longon EC4,   England 
  • Publication Date: 1967-8-18

Media Info

  • Features: Figures;
  • Pagination: p. 626-628
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00037828
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 15 1976 12:00AM