The railway signal business is a framework of Daido Signal and a mainstay of sales. With changes in circumstances involving in the domestic transport network, the technology required for the railway signal business has been greatly changed. Nowadays, it is indispensable not only to pursue after the speed and safety but also to develop the technology and amenity to realize various services in the total system of maintenance-free, automation and power saving. The railway signal business of Daido Signal supports "safety" and "life" in the countries all over the world as well as in Japan, and is expected to take the significant role and expectation.