I’m suggesting the Hertford Loop Line for Train Sim World. The route is 24 miles long and has stations. This Stations List: 1. Stevenage where you can connect to the East Coast Main Line: London to Peterborough. 2. Watton-at-Stone 3. Hertford North 4. Bayford 5. Cuffley 6. Crews Hill 7. Gordon Hill 8. Enfield Chase 9. Grange Park 10. Winchmore Hill 11. Palmers Green 12. Bowes Park 13. Alexandra Palace where you can also to the East Coast Main Line : London to Peterborough. Electrification: 25 kV AC OHLE Rolling Stock: Great Northern Class 717 EMU
Would probably be better off coming as part of a KGX - Peterborough route (the current ECML doesn't go to London btw).