Due to the non arrival of most of the visiting locomotives for the Swanage Railway's 2012 Diesel Gala, resident BR 4MT 2-6-4T steam locomotive 80104 was 'upgraded' to a diesel in order to help out. A spot of renumbering was in order, so it acquired a 'D' prefix for the event. Its new cabside number is pictured here at Harmans Cross on 13 May 2012.