European, preferably.
I've nearly given up by now, I think i just don't get the concept of content for Train Simulator. When confronted with the fact that there is so much payware DLC for TS, people will usually respond by saying two things: First of all 'you don't need all the DLC, you pick what you're interested in', and right after that 'also, there's lots of freeware content, too!'
Now, every single freeware route on 3rd party sites I've encountered so far and found remotely interesting does need a lot of DLC. Want an Austrian route? Got to own Semmeringbahn and Dreiländereck ('Three Country Corner'). German routes? Don't even try without owning München - Augsburg.
I get why, obviously. People use assets from the other routes, so they can't be provided along with the free route. But it's a steep obstacle for someone new to Train Simulator, especially someone who doesn't plan on spending a lot of time with it.