Had a go of the scenario planner and made a nice service - 21:10 Koln Hbf-Sindorf (S19) The S-Bahn will be a very nice addition to Koln-Aachen, more services and also the added feature of High Speed ICE services and RE/RB services overtaking!
If you own RRO when it's preserved it would add S-bahn & Freight. But with HRR it would add nothing.So they are already adding S-bahn services if you own RRO
Well I own HRR, and was able to create my own S19 scenario using the 422 and 425 which runs some RE1 services, so I’m happy with that!