 In 1989 the centenary of the branch saw a revival of interest in the line . Over the weekends of 1 – 2 and 8 – 9 July special services were run between Watford and Chesham , using two preserved Metropolitan Railway steam locomotives and a former MR electric locomotive . The service was a great success , with over 9 @,@ 000 people travelling on the trains and large numbers of people travelling to the area to watch the trains . The success prompted LT to repeat the Steam on the Met event annually until 2000 , although often running to Amersham rather than Chesham . 
