The number of journeys on the Elizabeth line has hit a new record of 800,000 a day.
Transport for London announced the latest figures as the £20bn line celebrated its third anniversary.
Since opening on May 24, 2022, the “Lizzie” line has been used for more than 600m journeys and has become well-established as the busiest railway in the country.
TfL said the line’s 70 trains had clocked up enough miles - 21.5 million - to reach the moon and back 45 times.
Three of its stations – Liverpool Street, Paddington and Tottenham Court Road – have become the three busiest in the country.
The line, which links Shenfield and Abbey Wood with Heathrow and Reading via central London, opened in stages, and trains initially were unable to stop at Bond Street due to the late completion of the station.
The project was completed more than three years late and about £4bn over budget – but is widely regarded now as having provided excellent value for money.
London mayor Sir Sadiq Khan said: “The Elizabeth line has been transformative to outer London. Many advised me to throw in the towel, and I refused to do so.”
Bassam Mahfouz, the London Assembly member for Ealing and Hillingdon, said the Elizabeth line had become “the nation’s favourite train line”.
Its stations have won awards and the economic impact of the line, and the boost it has given to property, has been substantial.
Abbey Wood has emerged as one of the largest regeneration areas in London, with a six per cent increase in new homes alongside expectations for further development over the next five years.
TfL found that, between 2015 and 2022, 378,000 jobs were created within 1km of Elizabeth line stations, including Southall, Paddington, Woolwich and Farringdon.
However, the line has not been without its problems in terms of reliability, with more than one in five trains delayed.
A total of 78.2 per cent of trains arrived on time between October and December last year – the second-best performance nationally after Greater Anglia (82.2 per cent).
But Keith Prince, a Tory member of the London Assembly, told the mayor: “The Elizabeth line is probably the most unreliable railway that you have.
“Every time I go to Heathrow on the Elizabeth line, there is disruption with one of my journeys.”
Seb Dance, the deputy mayor for transport, said: “The Elizabeth line exemplifies the benefits that investment in high-quality infrastructure can bring for both the city and the country.”
TfL commissioner Andy Lord said: “Its popularity and performance have exceeded expectations, and its success demonstrates the demand for sustainable, high-capacity public transport.
“We’re incredibly proud of what’s been achieved in just three years, with the Elizabeth line continuing to be a showcase for what investment in public transport can deliver in terms of wider economic benefits.”
A new consortium, GTS Rail Operations, will become the line’s operator on Sunday, replacing MTS Elizabeth line.
GTS is a joint venture between Go-Ahead Group, Tokyo Metro and Sumitomo Corporation.
Ten new trains have been ordered to increase capacity on the line, especially when it is connected to the new HS2 station at Old Oak Common by 2033.
HS2 passengers will use the Elizabeth line to transfer to and from central London until the HS2 link to Euston is completed, possibly around 2040, though a precise date has not been set.
