The ticket office at North Harrow Tube Station has been saved after a year long campaign.
Boris Johnson confirmed last night at a London Assembly meeting that plans to close the facility have been completely scrapped.
London's new mayor was asked to confirm the proposals would be culled by Harrow and Brent assembly member Navin Shah.
Mr Shah said: "I am absolutely delighted that the Mayor has listened to Harrow residents and the threat to North Harrow will be lifted with immediate effect.
"I'd like to congratulate all the local campaigners, residents and tube users on what is a wonderful victory.
"The result just shows what a persistent and sustained campaign can achieve."
Its closure had been earmarked for last year after Transport for London made plans to shut offices across the capital.
However, commuters, residents' associations and councillors backed a petition to fight the proposal, gathering 7,574 signatures.
Mr Johnson visited the station in Cambridge Road in the lead up to the mayoral election, to lend his support, but those behind the petition were concerned that once in power he might backtrack.
James Bond, who works in the office at the station, was delighted with the news and paid tribute to Mr Shah and Mr Johnson for their efforts.
He said: "I am absolutely elated, I'm on cloud nine.
"For the last year I have been eating, sleeping and breathing this campaign so it is a fabulous result.
"It's great news for the passengers because it is a service they deserve and one they appreciate."
Plans to close offices were based on surveys carried out to see the number of tickets bought from the office after the introduction of the Oyster card.
However, those behind the campaign argued that the office was more than just a place to buy a ticket.
Jill Kelly, 43, of Headstone Lane, uses the station everyday for her commute into London.
She said: "I may not need to buy a ticket everyday but it's important to have a figurehead in the station.
"The man in the office provides pivotal information about train times, delays, alternative routes, nearby bus stops and more than anything he is just a friendly and familiar face.
"His work doesn't end when he issues a ticket so to lose that role would have been a massive injustice."