It seems that the game doesn't recognize the fact that you are in a tunnel when its raining or snowing in the game... been getting wheel slippage all along the underground section when running a scenario or service that has rain or snow on the rails. I don't get any slipping when there is no rain... Just thought I'd point it out!
Yeah, I’m getting the same thing too. I’d understand it it was slippery after just entering the tunnel, but the whole length? That’s just not right.