This is a 4 wheeeled, 60hp 4wDH locomotive built by the Hunslet Engine Company (Builder's number 6659 of 1965), weighing 8.5 tons and fitted with a Gardner 4LW engine. It arrived at the railway in June 2004, having been regauged from 2ft 6ins by Alan Keef Ltd of Ross-on-Wye in Herefordshire. It was delivered new to the Royal Naval Armament Depot at Dean Hill in Wiltshire. With a top speed of 7mph, it was commissioned as a very useful workshops shunter but is unlikely to see much use outside the confines of Boston Lodge. Originally (and unofficially) at Boston Lodge the shunter was known as Castle Aarghhh, the loco was renamed Moel-Y-Gest in August 2005 following a repaint undertaken by young volunteers participating in that year's Kids Week under the supervision of Stephen Paul.
- Industrial Locomotives of Central Southern England - Roger Hateley; Industrial Railway Society. [1982?] ISBN: 9780901096418 OCLC: 16594371