In steel works, steel production from raw material to final product includes several processes. In the processes, pit iron from blast furnace is transported from furnace to storing yards going through factories. For the transportation, because of weight and high temperature of pit iron, torpedo cars towed by a locomotive on a railway in the compounds are used. For effective production, optimal scheduling of transportation is necessary. The transportation includes many constraints; there exist several factories where they should step by, an order among the factories to step by, restricted transportation time, and minimum working time in factories. Hence, to plan the schedule requires complicated calculation and computation time. Also, when an accident occurs and some paths in the plan are closed, they need calculate a new detour in short time period.
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