Today i will be suggesting Thameslink but a short route because all routes are way too long to make or play. so i have thought of east Croydon - Finsbury pk Thameslink would be very cool to come because its a nice commuter route I would also want this to be backdated to 2017 Locos: Class 377/5, Class 700 Trainings , In Training Center anyway i hope this gets considered, have a nice day!
This section of the route includes the hugely busy south london line, Milwall to London Bridge, the central core (which is all ATO so the driver only opens and closes the doors and presses the go button) and the short bit up to Finsbury. I don't think any trains from the South of the core terminate there so would be an add spot to end at.
Let me see linking BML with ECML South via the Thameslink Core section which is CBTC ATO overlaid on ETCS.