SimSig
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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.