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at 166, 82 there are three rail signals. I placed the rail signals for the top three (heading west) and on the third signal the game desyncs every time.
After I replicated this bug myself, I noticed that it looks like an old bug that I remembered seeing on the forums and thought had been fixed already. The server does not receive the rotation of rail signals properly. When we reloaded after the desync, the first two rail signals were not rotated the way they had been on our screen.