I see, thank you! If you like, you can just leave out the texture before cause it has annoyed you a lot and you can try to make a new texture instead if my pics could help you. :wave:Thanks for the pictures. I think to make the side windows transparent would require quite a lot of work. I'm nervous of trying to punch more holes in the original mesh as it is now at the point where using the boolean operator in GMax causes all sorts of nasty side effects which then have to be fixed up. I would rather leave the mesh as it is and try and get something reasonable through textures. It may be possible to use some parts of your photos to improve the textures.
I have to say I don't really like the Russian track sounds you suggested. They don't sound very realistic to me. If a tracksound is associated with the bogey this would make the loco unusable with TRS2004 so I'm not willing to do that. I create using TRS2004 and only use TRS2006 for testing.
Cheers
Dave

Leo