I think because the 150 comes off Willesden TMD a Pendolino passes on the mainline - not important to the scenario
Not sure where this scenario came from, but #FGN 0Z90 Crew Basford Hall SSM to Northampton on the WCML South route has an AP Class 86 light engine chasing yellows.
I've had favourited scenarios disappear from Drive. You can still see them in Build, where you can clone them and use the clone in Drive again, but you will have lost your saved session.
You do realise you have replied to a Post from February 2022 - Four Years ago I don't think that person is still on these groups