Rail Shuttle : A transit system that is characterized by a back-and-forth operation, usually over a short distance, and that may reverse its direction of travel without the vehicle having to turn around
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}