Unless I've missed some, I think those are all for WCML North, i.e. the DTG DLC.
I tried to create a few scenarios not long after the route came out but, for one reason and another, haven't got round to finishing them off. The thing that frustrated me a little was having signals showing red at various places (Willesden and Watford, I seem to recall) for no reason, i.e. the blocks ahead were not occupied, and TAB-bing didn't always seem to work. So the player train kept losing time for no real reason.
Other than that, I haven't experienced some of the lock-ups that I know others encountered, either on the original or with the modifications. It's a route with great potential, if one has the time to get to grips with its foibles. And definitely worth persevering with making scenarios.