That is simply amazing work! However, there are a few things that need some work:
1: The cab door on your model is inaccurate, it looks like this:
It is hard to see in the picture, but the entire window isn't actually opaque black. There is a smaller tinted rectangular window that is transparent inside that black window.
2: All the the cars in the train are labeled as car number 6022. You should make each car have it's own car number as in real life (remember that each 4 car set of R46s has car numbers in sequential order)
3: You should texture the inside of the cab, it looks weird seeing what would be the front of the train when looking through the cab window.
4: I also agree with other comments posted here, you should work a bit more on the connection between the trucks and carbody.
5: The doors should have those rubber edges modeled on them, that way it is more realistic when the doors are opened; you wouldn't be able to look into the gap between the inner and outer carbody walls that way.
6: The interior textures could use a bit of work, they are a bit blurry and I have this feeling that the color is slightly off.
But besides those things, I am absolutely astounded, that really is amazing work!
