Swiss Rail 2000 policy is a significant policy which has adjusted block times between major stations and timings of train departures on their rail network. In this study, we developed a computer system for searching an effective solution of improvement of intercity railway network considering such policy. This calculation system consists a Genetic Algorithm, because it has to solve a "Knapsack Problem": how much and which sectons sould be improved. We worked out some techniques for the problem

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... ith a lot of local solutions and for high-speed calculaton of Expected Value of Traveling Time. As a result of sample calculation of trunk rail network in Kyushu, we found that a policy like Rail 2000 may be a new basic rail policy, because smaller investment can bring out bigger effect considering block times and timings of train departures on the rail network. ,