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Similarity exists between moving large masses of people and the process industry. Both have fixed inputs, fixed outputs, predictable patterns, variables that can be measured, and corrections that can be made. Both entities respond to the principle of closed-loop regulation. From the experience gained in the San Francisco Bay Area Rapid Transit District (BARTD), a planned approach to coordinated and automated mass transportation systems is entirely feasible. Electronic controls are a major factor in providing an economic solution to the problem.