The only problem I've encountered with BRR is on the Plymouth route... inexplicably, it doesn't like some of the platforms, and seems to discard them before you've passed them... obviously somehow managing to infringe the "25 metre" rule... don't have this problem running Plymouth without BRR...
Must admit, I'm using BRR less and less... and, on the rare occasions that I do run it, it's mainly to inflict signalling delays.... I always found the "route" randomising a little disconcerting - ending up running on the wrong road.....
And as regards changing trains, here's a little tip I picked up somewhere.... instead of having a different copy of each of your favourite routes with each of your favourite trains, simply put all of your trains in the "with Train" section, but comment out the ones you don't want ... er, or is that "comment in" the one you do...??? ... like this....
with Train
.Folder ONE_class156
;.Folder 37901 Empty Steel Carriers
;.Folder HST4
... then, before you open the route, just change to the train you want by swapping semicolons and saving the change to the file .....
If you were so inclined, you could also list different timetable bitmaps, and comment them in or out, too.... wouldn't change the stopping or timing pattern, but would simply display a correct timetable bitmap in the cab..
Regards
eezypeazy