Provides a comprehensive, state-of-the-art review of the operation and control strategies of light rail transit systems (LRTS). Intended to serve as a basis for further research in the goal of developing an analytical tool for evaluating the operations of light rail at-grade within an urban signal system. Identifies the various at-grade crossing types that can exist for a LRTS, the operating characteristics of light rail vehicles, and the use of control devices at at-grade crossings. Summarizes both the priority strategies used by transit agencies and the methods of evaluation used to assess the impacts of LRTS.