Lea Valley Lines
|Lea Valley Lines|
A National Express branded class 317 at Edmonton Green.
|Type||Commuter rail, Suburban rail|
East of England
London Liverpool Street
|Rolling stock||Class 315
Class 379 "Electrostar"
|No. of tracks||2-4|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in) standard gauge|
|Electrification||25 kV 50hz AC Overhead lines|
|Operating speed||Below 75 mph (121 km/h)|
The Lea Valley Lines are three commuter lines and two branches in North East London, so named because they run along the valley of the River Lea. They were operated for much of their history by the Great Eastern Railway.
The first section opened, by the Eastern Counties Railway (ECR) on 20 June 1839 from the London end at Devonshire Street to Romford, extended on 1 July 1840 to Bishopsgate (London end) and Brentwood. The Northern and Eastern Railway (N&ER) opened its first section from the above line at Stratford to Broxbourne on 15 September 1840, and to Harlow in 1841; though it remained a separate entity the N&ER's line was leased to the EC from 1 January 1844. A branch from Broxbourne to Hertford was opened in 1843.
Enfield was reached on 1 March 1849 by a single-line branch from the N&ER at Angel Road via Lower Edmonton. The ECR was incorporated into the Great Eastern Railway (GER) in 1862. A shorter route to Edmonton was eventually provided by the GER in 1872, from Bethnal Green via Hackney Downs and Stoke Newington, which section opened on 27 May; the section via Seven Sisters and Lower Edmonton, at a new high-level station provided adjacent to the old, low-level station, opened on 22 July. The line from there to Enfield was doubled at the same time. The section of the old line between Angel Road and Lower Edmonton was closed to regular passenger trains in 1939, except for occasional diversionary traffic including the period in the 1950s when the rest of the local network was being electrified; the line closed completely in 1964 and the rails removed soon after.
Another branch divided off eastwards north of Hackney Downs to Walthamstow in 1870, extended to Chingford in 1873.
The final section built linked Lower Edmonton on the Enfield branch via Churchbury (later Southbury) with the Broxbourne line, meeting the latter at Cheshunt, opening on 1 October 1891; it was generally known as the Churchbury loop until the renaming of that station in 1960.
Route and services 
- Via Tottenham Hale. This line also forms the lower part of the West Anglia Main Line to Cambridge.
- Via Seven Sisters. This line has a branch via Temple Mills at the southern end to Stratford, diverging just south of Seven Sisters. The line splits north of Edmonton Green with one short branch to Enfield Town and the Southbury Loop to Cheshunt, where it rejoins the Tottenham Hale line.
- To Chingford.
A minor service occurs running on from the Seven Sisters branch to Stratford via the Gospel Oak to Barking Line and the West Anglia Main Line. This is one of only two places on the Gospel Oak to Barking Line where it is electrified.
The line is double track for most of its length, with some multitrack between Hackney Downs and Liverpool Street. It is electrified at 25 kV AC using overhead line equipment and a line speed of between 40-75 mph except between Cheshunt and Coppermill junction where the linespeed is 60-85 mph. Different sections of the line have different loading gauges. Most of the line is W8, with the branches to Enfield Town and Chingford being W6 and the branch to Stratford being W9.
- White, H.P. (1987). In Thomas, David St John. A Regional History of the Railways of Great Britain — Volume 3: Greater London (3rd ed.). Dawlish: David & Charles.
- "The Case for a Chingford to Stratford Rail Service". London Borough of Waltham Forest. Retrieved 2012-10-01. See also Greater Anglia Route Utilisation Strategy.
- "Route 5 - West Anglia". Network Rail. 2009. Retrieved 2009-05-26.