To commemorate the 90th anniversary of the opening of Watford station in 1925, the London Underground Museum ran a number of special trains between Harrow-on-the-Hill, Chesham and Watford. Working the first train of the day away from Harrow is Metropolitan Railway E class No. 1 and "Metro-Vick" electric No. 12 'Sarah Siddons' double heading with 'Small Prairie' 5521 on the back.