Using the former Poultney tender chassis fitted to River Esk between 1928 and 1931, the new Preservation Society designed a 2-8-2 locomotive, which was built by Clarksons of York in 1966 and commissioned in May the following year. River Mite was delivered to Ravenglass by traction engine. After overhauls in 1978 and 2006/7, she celebrated her fortieth year at Ravenglass in 2007. Mike is based on her.