Question: The Herford East branch line is part of a collection of London consumer routes called the Lea Valley lines that run along which river?
Sentence (from "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.
Relevant evidence: No