SimSig

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Screenshot of the Swindon version of Simsig
Screenshot of the Swindon version of Simsig
Screenshot of the King's Cross version of Simsig
Screenshot of the King's Cross version of Simsig

SimSig is a free PC-based software simulation of modern UK railway signalling systems, from the point of view of a railway signaller. Visually, it resembles the British Rail Integrated Electronic Control Centre, though most of the simulations do not cover areas operated by IECC-based signal boxes.

Although produced by signalling experts to ensure a high degree of realism, the simulations are usable by those without any in-depth or professional knowledge of signalling systems. Users can create their own timetables with the in-built editor. All simulations can be joined over the Internet to share the workload. Some simulations can be linked together to form a chain of signal boxes for extended simulation, for instance, simulations of King's Cross, Peterborough and Cambridge areas.

Railtrack asked for a "professional" version of SimSig, now known as TRESIM, which is currently used to train signallers at every (now) Network Rail IECC and several panel signal boxes around the UK.

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