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The report reviews the fourth year's efforts of the Urban Mass Transportation Administration's Urban Rapid Rail Vehicle and Systems Program. The objective of the Program is to enhance the attractiveness of rail rapid transit to the urban traveler by providing him with transit vehicles that are as comfortable, reliable, safe and economical as possible. Accomplishments for the year included the following: Completion of the five-city test and evaluation of the SOAC cars; progress from the preliminary design phase to delivery of initial test hardware; completion of the integration of a self-synchronous propulsion system, a monomotor truck, and a synchronous brake into the SOAC cars; and preparation of subsystem specifications.