Original: 2tph all stations to Tring 1tph to Milton Keynes 1tph to Northampton , via Milton Keynes 1tph to Birmingham New Street , via Northampton 1tph to Crewe , via Northampton , the Trent Valley , and Stoke .
Simplified: 2tph to Birmingham New Street , Northampton via Watford , Tring , Hemel Hempstead and Milton Keynes 1tph to Crewe via Nuneaton .