If existing infrastructure and bottlenecks were addressed I'd propose the following:
- XC Birmingham - Peterborough 2tph, of which one continues to Ely and Cambridge.
- 1tph Birmingham, Water Orton (1tp2h) Coleshill (1tp2h), Nuneaton, Hinckley, Narborough, South Wigston, Leicester and Peterborough
- 1tph Birmingham, Coleshill, Nuneaton, Leicester, Melton Mowbray, Oakham, Stamford, Peterborough, March, Ely and Cambridge
(peak services could make additional calls at intermediate stations)
- GA Stansted Airport - Peterborough 1tph calling only at Cambridge South (future), Cambridge, Cambridge North (possibly), Ely, Manea (1tp2h), March, Whittlesea (1tp2h) and Peterborough
- GA Stansted Airport - Norwich 1tph extended into peak hours, calling at Audley End, Whittlesford Parkway, Cambridge South, Cambridge, Cambridge North, Ely, Brandon, Thetford, Attelborough, Wymondham and Norwich
(alternatively Audley End and Whittlesford Parkway calls could move from Norwich to Peterborough services)
- GA Ipswich - Peterborough possibly shortened to Ipswich - Ely but increased to 1tph and timed to connect with Peterborough services. Could additionally have some service extensions to King's Lynn from Ely