I found out who made the BART Train. About 200 BART train sets were produced in 1978. The three-car basic set consisted of a powered A unit, and non-powered B and A units. Additional B units were offered to make longer trains. The set has dual head and tail lights, and the interiors are illuminated. The BART set is powered by a Marx double reduction geared motor, which allows for smooth operation at slow speeds. There is a two-position directional control that permits either forward or reverse operation. The set performs well on Lionel three-rail tubular track and switches. The company was called USTTC but their out of business now.
United States Toy Train Company: O-gauge tinplate BART and Metro sets, and freight cars Hope this helps. Don