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La línia es de doble via amb vies de tres i quatre rails entre Camden Road i Dalston Kingsland. L'antic tram de North Woolwich incloïa una secció de via única entre Custom House i Nort Woolwich, i el tram de Broad Street estava format de quatre vies. Ambdós eren vies de tres rails electrificats.
 
La línia està electrificada utilitzant el sistema de tercer rail des de Richmond a Acton Central, Camden Road a Dalston Kingsland i Dalston Kingsland a Stratford. Des d'Acton Central a Camden Road, Camden Road a Dalston Kingsland i Dalston Kingsland a Channelsea Junctions les línies estan electrificades mitjançant línies aèries.
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The line is [[Railway electrification in Great Britain|electrified]] using the [[third rail]] system from Richmond to Acton Central, Camden Road to Dalston Kingsland (southern pair of lines only) and Dalston Kingsland to Stratford. [[Overhead lines]] are used from Acton Central to Camden Road, Camden Road to Dalston Kingsland (freight lines only) and Dalston Kingsland to Channelsea Junctions (link to Temple Mills, Stratford High Level and Liverpool Street).
 
Quan va començar el servei a North Woolwich el [[1985]] els trens utilitzaven el tercer rail. Quan els trens van ser reemplaçats al llarg dels anys pels de Class 313 de sistema dual, es va fer possible la circulació per les línies electrificades que s'havien construït per al benefici dels trens de mercaderies.
When the through electric service to North Woolwich started in 1985 trains used the 3rd rail throughout. When the trains were replaced a few years later by dual-system Class 313 trains it became possible to use the overhead electrification system which had been added to parts of the line for the benefit of freight trains. There had been some unexpected difficulties with earth currents from the 3rd rail system which this overcame. This usage was steadily extended and the trains now make a number of changes between electrification systems during their short journey. These are at Dalston Kingsland, Camden Road and Acton Central.
 
== Connections ==
The line crosses or comes into contact with a very large number of railway lines, especially lines radiating from central London. This does provide opportunities to move between separate sectors of suburban London without having to enter the central zone.
 
=== Interchanges shown on the tube map ===
* at Richmond, to and from [[South West Trains]] services including the Kingston loop line
* at Gunnersbury, connecting NLL services north of the station to District line services east of the station
* at Willesden Junction, with the [[Bakerloo line]], [[Watford DC Line]] and [[West London Line]].
* at West Hampstead, with the [[Jubilee Line]] and [[First Capital Connect]] stations, each situated a short walk either side of the NLL station
* at Gospel Oak, to and from the Gospel Oak to Barking line of London Overground
* at Highbury & Islington, to and from the Victoria line and the deep-level main line tube via Finsbury Park to Moorgate, currently operated by [[First Capital Connect]] (and from 2011, the [[East London line]]).
* at Stratford, to and from the Central line, main line services between Essex stations and Liverpool Street, the Jubilee line, and Docklands Light Railway
 
=== Other interchanges ===
* at Brondesbury, to and from Kilburn station on the Jubilee line.
* at Finchley Road & Frognal, to and from Finchley Road station on the Metropolitan and Jubilee lines, a walk of about 400 m.
* at Camden Road, which is about 400 m from Camden Town on the Northern line.
* at Hackney Central which is about 500 m from Hackney Downs station for [[National Express East Anglia]] services.
* at South Acton, to and from Acton Town station on the Piccadilly and District lines. This is a walk of a little over 1&nbsp;km.
 
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== Current operations ==
=== Rolling stock ===