Merging routes aint easy but it can be done, the way I do it involves adding the route folders of one route in to that of a larger one, but because the track databases (to the best of knowledge) cannot be merged, it menas having to relay all of the track on the smaller route, which is no mean feat, I'm kinda hoping this might be done to join Woodhead with Mideast UK

on a future release.
As for the WCML, there is a section of it on the Warrington Railways route.
Regards