
I can imagine a 2048^2 map for the whole of Europe is way too small, you will run into so many problems around every city with some sort of S-bahn system. Even 4096^2 will be too small probably if you want to remake everything realistically.
But I will definitely start working on a Netherlands game again some time. I see some interesting patch packs have been released lately, that together with the beautiful Dutch train/station set(s) will make a very fine game...