This would be perfect for Norway. Oslo-Trondheim and Oslo-Bergen is consistently among the most trafficked air routes in Europe and the train ride is 7-8 hours. I love trains and use them whenever I can and even though I believe we should get better train infrastructure between the largest cities I also concede the fact that beyond those it's just not practical with trains all the way up north or out to the small coast communities.

Electric planes with a few hundred kilometers reach would suite our domestic travel juuust fine. I might even have started my European interrail trip with a short flight to Oslo or Copenhagen if electric planes where doable and reasonable (in terms of both cost and emissions).