My ideas for the map would be:
- An electrified mainline like the WCML/ECML
- Suburban electric branches off of the mainline
- Three or more different termini for that mainline
- Urban commuter lines
- Transpennine-style diesel mainline
- Rural diesel branch lines
- Numerous freight lines
- Express trains (Utilizing the Class 87/91 sets for electrics, HST sets for diesels)
- Electric commuter and regional trains (319/321 for longer distance/faster, 313/317 for shorter distance/slower)
- Diesel commuter and regional trains (158 for long distance, 150/153/156 for medium distance, 142 for short distance)
- Freight trains (90/92 for electric, 37/47 (57) for diesel)
- Urban trains (323/142/15x)
- Tube trains