or is a computerized control system used by the East Japan Railway Company to regulate train traffic on railway lines in metropolitan Tokyo, Japan. It was designed by Hitachi. The first deployment was on the Chuo Main Line in 1997. It is now used on fourteen lines listed below.

Atos SE is a European IT services corporation headquartered in Bezons, France, that provides consulting & managed services and systems integration, hi-tech transactional services, cloud and cybersecurity services. Atos operates under the brands Atos, Atos Consulting & Technology Services, Worldline, Atos Worldgrid and Atos Healthcare.