I have received a tip:
Flight from Bergen to Voss - where you follow the train from Bergen to Voss.
The train is currently invisible in Aerofly FS2 - but you can see the trip from the locomotive driver's view in a video (Youtube). You get regular information about where the train is.
Can you fly in parallel with the train ride?
Combine what you see out of the cockpit - with what the driver sees when driving on the railway track?
Advisable to have a map available.
Open YouTube and search for: Bergensbanen minutt for minutt Bergen–Oslo (full HD 50fps)