I got hold of the original Noch documentation just to see where things went wrong. I could see this because the previous owner chopped up a few pieces of track "replicate" a point...
I then looked at it all and saw the "mistakes" made. According to the Noch plan (which have layout plans for Roco, Fleischmann, Trix in N and even Marklin Z) there should be a third line at the front, among others.
Then I noticed the tunnel - too small for a double track. Man was I pissed off. Luckily Evert came along and pointed out I was looking at the Z scale plan - bliksem!

It took me
only 2 months to realize that!!!!
At least progress are being made...