KnowraLondon UndergroundLinked fromLinked fromThe 12 pages that link to London Underground, each with the reason it gives.All 12Broader topic 2Related 3Narrower topic 1Compared with 6LondonRelated: Its lines connect central districts with London's wider urban area.Urban rail transitBroader topic: It is an early and influential example of urban underground rail.New York City SubwayCompared with: Its separate line structure and service conventions differ from New York's shared-track network.Moscow MetroCompared with: Its layered history contrasts with Moscow’s more centrally planned origins.Heathrow AirportRelated: The Piccadilly line has connected Heathrow with London since 1977.Madrid MetroCompared with: Its older, varied infrastructure contrasts with Madrid’s later, more standardized expansion.Saint Petersburg MetroCompared with: Its older, shallower and more varied network contrasts with Saint Petersburg’s deep station design.7 July 2005 London bombingsRelated: Three bombs exploded aboard Underground trains travelling on this network.Budapest MetroCompared with: It predates Budapest's metro, while Budapest's first line pioneered electric underground operation on the continent.Piccadilly CircusNarrower topic: Its Piccadilly Circus station connects the junction to the wider city.Brussels MetroCompared with: Its extensive network offers a useful comparison for a capital-city metro serving a wider urban area.History of LondonBroader topic: Its expansion changed how Londoners moved across an increasingly vast city.