Country Railway Routes Northampton to Peterborough including the Seaton RouteCountry Railway Routes Northampton to Peterborough including the Seaton Route 20. 95 by Vic Mitchell & Keith Smith For five years, this was the main line between London and Peterborough, but it then became a rural route and closed early. Thus, it had much charm and aged trains. Both are seen in the varied historic photographs herein, along with the assorted stock of the present Nene Valley Railway. Stations & Locations Stations Photo Northampton