The Route Suggestion I have would have would be The Midland Mainline from Corby to London but with the Thameslink branch through London to East Croydon, I'd set it in the late 2010s so you could have the Thameslink 700s which would also then be used in SEHS and London Commuter and the EMR 222s/HSTs (reskinned from GWE) therefore giving a mix of tractions giving various routes extra trains aswell. Obviously the 222s would run Corby to st pancras and the 700s Bedford to East Croydon
