Thank you both of you, i managed to make it work.
Edit: I don't understeand why there is also sound coming out of path_track, everytime it reaches the path_track it playes elavator sound out of it, train sound is being played normal.
Turn off raw mouse input. This same problem is present in the latest Half-Life SDK.Yeah, i tried that, it dosen't work, i tried both from console and settings.