Those on board will be served cream teas in the vintage carriages, which will be topped and tailed by the locomotives.
31806 is the oldest of only 4 surviving U Class trains in preservation, and Mayflower has two cylinders, six driving wheels, and can operate at 75mph.
Stops at Portsmouth will be part of a longer ride from London to Portsmouth and the Isle of Wight as a Father’s Day special.
The ride has been organised by The Steam Dreams Rail Co.
To find out more, and to book tickets, visit steamdreams.co.uk