The proceedings of the Joint International Light Rail (LRT) Conference that was held in St. Louis, Missouri, on April 9-11, 2006. The conference focused on planning and urban integration, vehicle design and innovation, infrastructure use, security and fare enforcement, new infrastructure design, the case for contracting, LRT and bus rapid transit, regulations and standards, accessibility, streetcars, financing and controlling capital costs, operations, supervision, and service quality. The circular includes 26 papers presented at the conference. Please note that this is a very large report and it may take a number of minutes to download even with a high speed connection.