Zurich is the original set that was released. Interlaken contains certain bugfixes, better color correction and consistent with IC2 set in terms of colors used (I got materials from DB so it was possible use official colors).

As for ICE3, it's next one after 120

Hey REV0, as a train n00b I can't figure out the difference between the BR401 'Interlaken' and BR401 'Zurich', what's the difference?

Also, have the ICE 3 and 4 remakes been cancelled or been put on the backbench until you've completed the BR 120 and 184 projects?

8 car version mostly works with any station in WS except vanilla length ones. XL branch works with custom builds. I made a tutorial about those already, you can access it from my profile -> guides.

would be great if there are also a few stations for such long trains