Fixed Guideway Directional Route Miles (FG DRM) : The mileage in each direction over which public transportation vehicles travel while in revenue service on fixed guideway
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}