I honestly love your models, and I'm making drivable trains out of your American locomotive props using the Metrostroi wheels and bogey which makes me connect them because of they bogey's coupler in it.
I love how you're hollowing out the cabins, so we can actually put seats in there. I make them drivable with thrusters, like I said using the Metrostroi wheels.

Maybe, if you have spare time, could you make some passenger stuff, like the Amtrak's Genesis, Acela (HHP-8), some passenger carriages and maybe some of the carriages with and without doors, so we can make them open by a configurable hotkey by using the seperate door's prop. I'm a fan of your work. You're gonna make me play GMod 24/7 if you will actually create this.

http://shop.bachmanntrains.com/images/HO_Scale/83013.jpg

http://katousa.com/N/ACS-64/photos/ACS64-Pre_02.jpg

https://s-media-cache-ak0.pinimg.com/736x/e1/27/6b/e1276b1a99a904e076cdd84ecac1d361.jpg

https://s-media-cache-ak0.pinimg.com/736x/39/8b/cb/398bcbab2fead22726f3f6206ed7828b.jpg

http://4.bp.blogspot.com/-yXlhrYFIiaY/TaJV4wIRDVI/AAAAAAAABOs/p39bB-pALzI/s1600/photo-750579.JPG

Love your work!
~ Sirion