The Earl of Wessex will mark the completion of London’s Crossrail project by traveling on the Elizabeth Line.
Edward will be greeted by Prime Minister Boris Johnson, London Mayor Sadiq Khan and London Transport Commissioner Andy Byford at Paddington Station on Tuesday.
He will meet the staff who played a key role in the project and who will run the railway, including train drivers, station staff and apprentices.
The Earl will unveil a plaque before using a commemorative Oyster card to purchase the first Elizabeth Line ticket.
He will then travel on a train to Tottenham Court Road station before returning to Paddington.
The Elizabeth line, named for her mother the Queen, will open to passengers on May 24.
It was hoped the head of state would be involved in the opening, but she missed a number of major events this year due to ongoing mobility issues.
Crossrail, the project to build the new east-west railway, has been delayed and over budget due to numerous issues including construction difficulties and complications in installing signaling systems.
It was due to be completed in December 2018 and had a budget of £14.8 billion in 2010.
The total cost was estimated at £18.9 billion, including £5.1 billion from the government.
The Elizabeth line will increase capacity and reduce journey times for trips in the capital.
It will stretch from Reading, Berkshire, and Heathrow Airport, west London, to Shenfield, Essex, and Abbey Wood, south-east London.
The trains will initially run in three sections, which should be integrated in the fall.