I must admit, there has been very little... progress on this locomotive over the 2 and a half months that it has been active. I wouldn't jump on FSP merely for stating the facts as they are. Sometimes a good frank opinion is hard to come by.
Personally, I think you may have gone about this project entirely in the wrong way. It appears from your original post that you have very little prior experience with GMAX or any other 3D modeling application.
If that is true (and please excuse this impromptu lecture if it isn't, I do not intend to offend), I should like to make this one point clear: you can't just start out with something as complicated as a locomotive.
For instance, I started out with simple things like wineglasses, worked my way up through penguins and billboards, then started on buildings. I didn't create a fully realized locomotive until only about a month ago after 4-odd years of practice. (I still can't figure out how to get it into Trainz, though. :|)
So, in short, if you want to make this locomotive go from more than a beveled rectangular prism into a whole locomotive, you're gonna need a lot of practice.