There is a newer edition of this document available. This first-edition applies to car bodies for newly constructed light-rail vehicles for transit passenger service in North America. RT-1 - 2009 defines requirements for the incorporation of passive safety design concepts related to the performance of the car body of light-rail vehicles in collisions, so as to enhance passenger safety and limit and control damage. This Standard does not cover heavy-rail transit vehicles, automated people movers, and freight, commuter, high speed, or any other rail vehicles under the jurisdiction of the Federal Railroad. RT-1-2009 joins with RT-2-2008 Safety Standard for Structural Requirements for Heavy Rail Transit Vehicles, to serve as the first standards of their kind for North America. They arose from an industry groundswell to address the heavier-duty carbody requirements of North America versus those of Europe (which are governed by European standards EN12663, EN15663 and EN15227.) The result is a pair of uniform standards suitable for adoption by all levels of domestic jurisdiction, while providing state-of-the-art guidelines for other nations considering carbody standards for their rail-transit systems. Both Standards are also unique for utilizing Crash Energy Management (CEM) protocols. CEM represents the latest best-practices of design, testing, analysis and manufacture?enhancing crashworthiness by assigning certain sections of the carbody the task of absorbing a portion of the energy of collision by crushing in a controlled manner. Proper application of CEM preserves occupant volume, while minimizing the consequences of occupant impacts with the vehicle interior. Production efficiencies may also be realized via CEM, although heightening passenger safety is the main intent.