Just found myself admiring the demo.sve (whoever did that did a good job! ;) ) , when I noticed that one or two things are awry in the Experimental version compared to the standard version. Slow freights have stopped using the slow loops to allow overtaking. The choose signal at Casterbridge West Yard causes trains to back up when something tries to not stop at the yard. Underground trains had "no route" ... little things.
Low priority, I'll note, but still, thought I'd report it.
Ahh, the save (which is excellent) was made in an earlier version and subsequent Experimental features might well have affected it. You're more than welcome to produce a revised version if you are so inclined...