Scrolling through reddit and found a funny post:
https://www.reddit.com/r/Factoriohno/comments/1qr0niq/theres_gotta_be_an_easier_way_to_turn_trains/
(https://i.imgur.com/oQwujp1.png)
https://i.imgur.com/oQwujp1.png
It's about how to turn a train around, but it's not the most efficient way - it's a silly joke.
But stuff like that would be fun to deal with in Simutrans.
I mean, I think it's better that trains do turn themselves around since a tile is also 1km¹.... but still, this would be fun to model as well :)