<b>Study on Interlocking Devices in a Cloud Computing Environment</b>

We report on our study and proposal for interlocking devices in a cloud computing environment. This proposal realizes resilience, reduces time and cost of replacement, and provides interlocking processes as a service. The proposed system has the feature of processing interlocking logics of different stations independently. Furthermore, the proposed system has three layers: terminal devices to interface track circuits, signals, and switches, etc., logic units to process interlocking logics, and controllers to assign the interlocking table to logic units. We defined the specifications for terminal devices, logic units and controllers, and verified them.