Project Description


Signal Modernization at Stockholm Metro

How a modern automation process can improve both relay- and computer-based interlocking

In this white paper we will take a closer look at two distinct projects of Stockholm Metro; the extension of one of the subway lines and the capacity increase project on a suburban rail line. One using legacy relay-based interlocking and the other utilizing modern computerized interlockings.

Stockholm Metro has a diverse and complex network with light rail, suburban rail and subway systems. Its signaling systems are a mix of computerized and relay-based interlockings, with modern, centralized traffic management systems.

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