UKTrainSim

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Maybe the larger site/forum regarding TS. You can find there a lot of usefule hints and info’s.

SegnaliFS

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The best resource to learn and understand the italian signals and traffic rules.

Rotabili Italiani

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Small italian community related to TS2017 and TSW, really active in route, assets and scenarios creation, especially for italian railway.

Rail-sim.de

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Wide german site on train simulation, very useful information there, even if only in german language.