This paper discusses the use of a GPSS/360 simulation model to analyze the bus service of the metropolitan bus system in Madras, India. The system has been unable to obtain enough buses to keep pace with demand and has waged a constant battle to keep its existing buses rolling. The factors contributing to the system's major operational problems have been identified and incorporated in the model. A comparison of the model's output with historical data shows that it is suitable for analyzing operational pro blems, and it is expected to be useful for tactical planning and for improving future operations.
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