Hy there, first things first,
I love the Game so much and spend a lot of time in it jet.
Since the Trains are out now for a couple of weeks i hardly recommend more than before that it would really helpful to have triangle foundation. I build my rails only on a "elevated foundation track" through the map as its makes building it much more easy and it looks just way better then the rail on the ground.
So to have some nice turns or just a sloped path it would be great to have those triangle foundation as it brings more variety in building factory buildings as well.
Keep up your great work. i stay tuned