Sound artefacts.

[yG1n]

Good day, guys. Maybe somebody getting sound trouble like this. As you can hear, I'm getting sound artifacts.

[Donion]

Ooh, that's a good one.
The issues is that the locomotives above and below are at the exact same distance from the middle one and there is a limit of 2 locomotive sounds at any given time, which locomotive gets to play is search order dependent in this case. I'll do some thinking for a fix (for 2.0, this is a miner issue)

[yG1n]

Yep, I thought about that. But I don't get this sound early I found a way to remove this bug. Decrease (or increase) max_sounds_per_type right here.
But I think it is not a solution)

[Donion]

Yes, max_sounds_per_type = 2 is the limit I was talking about, increasing or decreasing it is a solid workaround.
Proper fix is now done for 2.0, thanks for the report.