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May I submit signaling simulators?

There are a number of options out there... SimSig (https://www.simsig.co.uk/) covers modern, fully electronic systems, and Blockpost (https://blockpostsoftware.co.uk/) covers old-school mechanical lever-frame and bell operations.

Judging by the author's name, the software is Czech.

Polish.

No. A British Flag installer would be

Think, SteamCAD's dev would add it into SteamCAD2[0]

[0] https://github.com/oskardolch/SteamCAD2

That's not very British.