SIMPLE VIGILANCE AND DEADMAN DEVICE

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:
  • RAILWAY GAZETTE
  • Volume: 123

Subject/Index Terms

• TRT Terms: Air brakes; Automatic train protection; Brakes; Braking; Cab signals; Control systems; Locomotives; Safety; Technology; Vacuum
• Geographic Terms: United Kingdom
• Old TRIS Terms: Braking systems; Vacuum brakes
• Subject Areas: Railroads; Safety and Human Factors; Vehicles and Equipment;

Filing Info

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