Did this a few years back after getting the ferry from North Shields to Bergen for a weekend away. www.norwaynutshell.com/en/explore-the-fjords/norway-in-a-nutshell/

Really recommended and worth the money (although we paid £70 for the day each opposed to the £120 it is now.)
The 8/9 hour day included a train journey to Voss, a change onto the Flam Railway (search for it if you havent seen/heard about it), onto a ferry for a trip through the fjords, onto a coach to travel via some hairpin bends to the station for the train back to Bergen - with time to stroll about and appreciate the sights all along the way.

The only other rail journey abroad was a few trips in Holland, including a return trip on a double decker train.