Trainline support most of the Europe. Used it from Poland to Portugal, not much of a hassle.

It does miss some regional train tickets which could be found on local platforms but major lines are covered fine.

Wow, that's some voyage. How was it?

The worst part is Germany as usual. Had to change some trains with buses on Gdansk-Berlin route.

Other than that it was quite good and on schedule. I’ve used railpass so it was also cheap enough.

My longest voyage was Moscow-London back in the days when Moscow-Berlin and Moscow-Paris trains existed (pre-covid).