SimSig
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SimSig is a free simulation of what UK signallers (dispatchers) do on a day-to-day basis and is based on the British Rail Integrated Electronic Control Centre technology in use at several signal boxes around the UK.
Simulations are produced by signalling experts to ensure a high quality of simulation. 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 signalboxes for extended simulation.
Later Railtrack, the successors to British Rail, asked for a "professional" version of SimSig. This has been developed and known as TRESIM (pronounced tree-sim) and is currently used to train signallers at every [Network Rail] IECC and several panel signal boxes around the UK.
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