It depends what tunnel you use. On some as the ones in 04, the inside was not dark enough, but the light from the engine will light it. If you use a tunnel that is a spline, it could be very dark, but the light from the engine lights nothing. Some tunnels have tracks built in. Splines ones you add the track. Buit I have not seen (hear) a tunnel track that simulates the noise of a train in a ..tunnel! I have tried to use HP track with bridge noise and it get's close, but not exact to the booming sound I am used to. I think these are refinements Auran or somebody else should make. As per the rain and snow, this is an old matter, and I am tired of talking about it. A matter of the deaf ears of Auran (I think that just a comment could pacify all of us)