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Under the recent social situation, in the computer system, non-stop service all the year round and continuous evolution of the application have been required. This is not considered as an exception in railway control system that has very severe real-time restriction. The Autonomous Decentralized System (ADS) is known as the concepts that overcome these issues. In this paper, the online expansion technology in real-time system that applied the autonomous decentralized architecture is proposed, and the autonomous decentralized railway signal control system is proposed as a practical use.