USE OF ELECTRONIC COMPONENTS IN SIGNALLING. METHODS FOR CALCULATING THE PERFORMANCE OF SAFETY SYSTEMS

In Report No. 3 it was shown that three classes of state could be distinguished in a safety system, namely, operational state, failure state contrary to safety, and safe failure state. From these states, the availability, reliability and safety of a system can be defined. The present report describes the calculation techniques for systems which are non-repairable during a mission. A theoretical study is made of possible system structures in revealing the general characteristics of these. Then, by way of example, several special cases are treated numerically.

• Supplemental Notes:
  • Restrictions on the use of this document are contained in the explanatory material.
• Corporate Authors:

  International Union of Railways

  Office of Research and Experiments
  Utrecht,   Netherlands 
• Publication Date: 1975-4

Media Info

• Features: Appendices; Figures;
• Pagination: 45 p.

Subject/Index Terms

• TRT Terms: Fail safe systems; Reliability; Risk analysis; Safety; Traffic signal control systems
• Old TRIS Terms: Question a118; Signal systems
• Subject Areas: Railroads; Safety and Human Factors;

Filing Info

• Accession Number: 00052729
• Record Type: Publication
• Source Agency: International Union of Railways
• Report/Paper Numbers: A118/RP 6/E
• Files: TRIS
• Created Date: Mar 29 1976 12:00AM