regauged to 600mm gauge, and named 'Bob Davies' in honour of a remarkable local railwayman. 'Chilmark''', Ruston & Hornsby, works no. 194771, the oldest of the railway's diesels (a 40DL diesel mechanical 3-speed built in 1939 for the Air Ministry), used by the Royal Air Force for hauling explosives and ammunition at RAF Chilmark , Wiltshire. 'Lady Madcap, a Ruston & Hornsby 20DL, which sees only occasional use for light shunting and ballast ploughing. A new addition to the fleet is a track maintenance trolley in the style of a standard-gauge Wickham trolley. Current and former locomotives See also British narrow-gauge railways References External links Bala Lake Railway Llanuwchllyn Heritage Centre` Heritage railways in Gwynedd Heritage railways in Snowdonia Narrow gauge railways in Gwynedd Narrow gauge railways in Snowdonia 2 ft gauge railways in Wales Articles containing video clips