Hollingsworth, Brian (1981). Ffestiniog Adventure:The Festiniog Railway's Deviation Project. Newton Abbot: David & Charles. p. 67. ISBN0-7153-7956-9. OCLC8709663.
Bradley, Vic (1993). Industrial Locomotives of North Wales. London: Industrial Railway Society. ISBN0-9010-9672-5. OCLC27769657.