The Hertford East branch line, and Lea Valley lines, are both in which country?
Lea Valley lines The Lea Valley lines are two commuter lines and two branches in North East London, so named because they run along the Lower Lea Valley of the River Lea. They were part of the Great Eastern Railway, now part of the "Anglia Route" of Network Rail.
St. James Street railway station St. James Street railway station is in Walthamstow in the London Borough of Waltham Forest, east London, and is in Travelcard Zone 3, on the Chingford Branch Line of the Lea Valley Lines. The station, and all trains serving it, are operated by London Overground.