London to get some of the world's 'most advanced' trains

London is set to get some very hi-tech new trains!

Transport bosses say they are in technological terms some of the world's most advanced trains.

The trains will be part of London's tube system and will run on the Piccadilly line. They will be much bigger and include air-conditioning, for a cool experience when they roll into stations soon.

The Piccadilly line is know as a 'deep tube', meaning it is designed to travel through the deep, narrow tunnels that make up some of the tube network and can be as deep as 67 metres below the ground.

"This is a state-of-the-art train," said Sarita Coultate, who is the project's senior manager for Transport for London (TfL).

"It comes with novel technology that's never been seen on a deep tube before."

The trains will also be way bigger and have better accessibility, she added.

"You could walk from one end to the other, so it'll feel spacious - so lots of customer experience benefits."

The trains will have new cooling systems and CCTV system for safety.

"I don't think there's a train in the world that's as far advanced," said Brendan Sothcott, an engineer on board and in charge of the movements and safety.

But a lot of work still needs to be done before the new trains start transporting people.

Engineers are building a new railway lines for the trains. Much of the tube network was built in the Victorian era and so lots of building work needs to be completed to make sure the tube is safe.

The trains were due to be up and running in late 2025 but they have been delayed.

Transport for London has announced that the trains will be in service at some point between December 2026 and June 2027.

TfL commisioner Andy Lord says: "These trains are the latest, highest-tech design we've ever had on the Tube network."