== Eksterne henvisninger ==
{{commonskat|Northern Line}}
* {{kilde www|url=http://www.davros.org/rail/culg/northern.html|titel=Northern Line|dato=2008-02-07|udgiver=Clive's Underground Line Guides|besøgsdato=2008-07-11}}
* [http://muswellhillmetrogroup.atspace.com/ Muswell Hill Metro Group]
* [http://www.trainsimcentral.co.uk/northern.htm Northern line-ruten] til [[freeware]] togsimulatoren [[BVE Trainsim]]
* {{kilde www|url=http://underground-history.co.uk/northernh.php/|titel=Northern Heights|dato=2005-02-23|udgiver=Underground History|besøgsdato=2008-07-11}}
* [http://londonist.com/2009/05/google_street_view_a_journey_along.php Den overjordiske rute for banen fra Morden til Edgware], konstrueret fra Google StreetView
* [http://www.architecture.com/LibraryDrawingsAndPhotographs/Exhibitionsandloans/VARIBAArchitecturePartnershipexhibitions/UndergroundJourneys/UndergroundJourneys.aspx London Undergrounds arkitektoniske historie i 1920-30'erne] {{Webarchive|url=https://web.archive.org/web/20110707160249/http://www.architecture.com/LibraryDrawingsAndPhotographs/Exhibitionsandloans/VARIBAArchitecturePartnershipexhibitions/UndergroundJourneys/UndergroundJourneys.aspx |date= 7. juli 2011 }} fra [[Royal Institute of British Architects]]
** [http://www.architecture.com/LibraryDrawingsAndPhotographs/Exhibitionsandloans/VARIBAArchitecturePartnershipexhibitions/UndergroundJourneys/FitnessforPurpose/OldStreet.aspx Old Street, Angel og Stockwell Stations] {{Webarchive|url=https://web.archive.org/web/20110707161133/http://www.architecture.com/LibraryDrawingsAndPhotographs/Exhibitionsandloans/VARIBAArchitecturePartnershipexhibitions/UndergroundJourneys/FitnessforPurpose/OldStreet.aspx |date= 7. juli 2011 }}
** [http://www.architecture.com/LibraryDrawingsAndPhotographs/Exhibitionsandloans/VARIBAArchitecturePartnershipexhibitions/UndergroundJourneys/MovingUnderground/MovingUnderground.aspx South Clapham, Tooting Bec og South Wimbeldon]{{Webarchive|url=https://web.archive.org/web/20110504024751/http://www.architecture.com/LibraryDrawingsAndPhotographs/Exhibitionsandloans/VARIBAArchitecturePartnershipexhibitions/UndergroundJourneys/MovingUnderground/MovingUnderground.aspx |date= 4. maj 2011 }}
Historie Foreninger Organisationer