Track (Trip) : A device that is located near the track and interconnected with the signal system in such a way that the brakes of a train that passes a red signal will be applied and the train will be brought to a stop
Ilan Kelman (ed.), Vulnerability and Resilience Definitions and References, Version 2, 2007. http://www.islandvulnerability.org/docs/vulnres.pd f, (Vulnr and Resilience - Brit) {524}