How to proceed after finishing a scenario? The Debrief screen only has a Main Menu button, which takes you back to the start screen.
And all the tedious route and train selection starts anew.

There are postings at Steam's board and over at UKTS to replace TS2015 menu screens (the flash animations) with TS2014's, but that is obviously not working 100% either. There is no Debrief screen, and you are left with no option than to click the red x and start the game anew.
Selecting your route and train is so much easier with TS2014, I'll take that rather than the TS2015 menu crap.
Not impressed with TS2015 from the player viewpoint. Hopefully creators have a more positive experience.