To obviate NLR trains running on the busy Euston main line, the Hampstead Junction Railway was opened from the NLR at Camden Road to Willesden via Hampstead Heath in 1860.
For at forebygge at NLR-tog kørte på den travle Euston-hovedbane blev Hampstead Junction Railway åbnet fra NLR ved Camden Road til Willesden via Hampstead Heath i 1860.