People who share their name with Prince William and Kate Middleton will be able to travel for free on Merseyrail trains on the day of the royal wedding.
Those with the first names William, Will, Kate, Katie, Catherine, Kathryn (or a variation) will have free travel on the local service on Friday.
The company said the offer only applied to day tickets and travellers would have to have proof of ID.
It also only applies to those who share a first name with the royal couple.
The firm runs trains in and around Liverpool city centre, to Wirral, Chester, Ellesmere Port, Southport, Ormskirk and Kirkby.
The company will run a Saturday service on Friday.
Rudi Boersma, from Merseyrail, said: "I guess it is our way of sharing celebrations with the people of Merseyside.
"If you are called Kate or William, turn up at a station tomorrow, show some ID and get a free ticket before you get on the train and travel all day long anywhere you like on the network for free."