A refurbished fleet of 12 trains has been introduced by Heathrow Express in the first revamp since the launch of the service in 1998.
Features include more space for wheelchair users, double the number of toilets and a continuous gangway through the whole train.
Business First passengers on the 15-minute connection between central London and Heathrow gain worktables and extra legroom.
The carriages include USB plugs with every plug socket, making it easier for international passengers to charge devices.
More and improved TV screens show live flight and rail connection updates, daily news highlights and shopping deals at Heathrow.
On-board 4G enabled Wi-Fi will work continuously across the airport.
Only two trains an hour are currently operating due to Covid-19 restrictions.
The company is “closely monitoring the changing travel landscape and is working with colleagues at Heathrow and across the travel industry to ensure that the service is returned to its regular schedule of every 15 minutes as restrictions ease”.
Director Sophie Chapman said: “I am delighted to introduce the new Heathrow Express 387 fleet, which will provide Heathrow passengers with a modern, reliable train for their journey between central London and the UK’s hub airport.
“We are proud to be serving passengers who need to make essential journeys during lockdown, and they can be reassured that our new trains are subject to a comprehensive anti-bacterial cleaning regime, as well as providing the best and fastest service between central London and Heathrow.”
Fares start at £5.50 for a single online advanced ticket. Fully refundable tickets lead-in at £22 single and £32 for Business First.