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Terminus of the Euston-Watford Line, part of the London Overground network. Internally to TfL, it's considered as being in zone W for the purposes of Oyster PAYG and Travelcards, but "zone W" is never used on anything customer-facing.

(The Wikipedia entry on the Euston-Watford line notes that services from here are advertised as being for South Hampstead rather than Euston, to dissuade people from using it to travel to Euston, but it doesn't say why they want people to be dissuaded; also, this line is the route that JourneyPlanner suggests between the two stations.)

Also served by non-local lines including the West Coast Main Line.

See also:

• Station information from National Rail
• Wikipedia entry