Safety and availability evaluation of railway operation based on the state of signalling systems
2016 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017Article in journal (Refereed) Epub ahead of print
A framework is presented to evaluate the safety and availability of the railway operation, and quantifying the probability of the signalling system not to supervise the railway traffic. Since a failure of the signalling systems still allows operation of the railway, it is not sufficient to study their effect on the railway operation by considering only the failures and delays. The safety and availability are evaluated, handling both repairs and replacements by using a Markov model. The model is verified with a case study of Swedish railway signalling systems with different scenarios. The results show that the probability of being in a state where operation is possible in a degraded mode is greater than the probability of not being operative at all, which reduces delays but requires other risk mitigation measures to ensure safe operation. The effects that different improvements can have on the safety and availability of the railway operation are simulated. The results show that combining maintenance improvements to reduce the failure rate and increase the repair rate is more efficient at increasing the probability of being in an operative state and reducing the probability of operating in a degraded state.
Place, publisher, year, edition, pages
Research subject Operation and Maintenance; Mining and Rock Engineering; Quality Technology and Management
IdentifiersURN: urn:nbn:se:ltu:diva-9431DOI: 10.1177/0954409715624466Local ID: 80be67df-554a-4524-a31a-4fdc3fcfb204OAI: oai:DiVA.org:ltu-9431DiVA: diva2:982369
Upprättat; 2015; 20151223 (ampmor)2016-09-292016-09-29