[mandrill7]

Okay, thanks. I got it.

I didn't know the trick with the delete key.

What I'm doing so far is to draw a 3 pixel "corridor" of my basic "flat, smooth grassland" tile, which is RGB20 in my load.ini. Then I draw in the 1 pixel road/ railway on top of that. I can clean up and put in other landscape elements later.

Cheers!