Trains connecting London with Luton Airport are to be upgraded as part of a £27.6 million refurbishment scheme.
East Midlands Railway is improving the service, which links the airport with London St Pancras with departures every half an hour six days a week.
The upgrade will see the fleet of Luton Airport Express trains refurbished with new 2+2 seating in a mixture of airline style and bay seats.
Expanded luggage racks, new charging points and passenger information systems are to be installed.
More than 530,000 passengers have used the service linking with the Luton Dart transit system at Luton Airport Parkway station since its launch a year ago.
Airport chief executive Alberto Martin said: “The Luton Airport Express service has brought London Luton airport even closer to central London, with a faster, more frequent and more convenient service that, including the Luton Dart, takes around 30 minutes door-to-door.
This investment is exciting news and will deliver an enhanced on board passenger experience, with improved interiors and modernised technology, strengthening the appeal of rail as a sustainable travel option for passengers travelling to and from the airport.”
East Midlands Railway managing director Will Rogers added: “This multi-million-pound investment is fantastic news for Luton Airport Express passengers and will redefine their travel experience, offering them more convenience, comfort and better facilities.
“We have seen the number of passengers grow by more than 40% since the service linked up with the Dart 12 months ago, providing a faster, more convenient and environmentally friendly way to get to and from London Luton airport.”