Was named by Wilf Julius Hilder, former employee of the Department of Lands. Wilf named features in this area based on a steam railway theme; this was due to the existence of the former Wolgan Valley Railway Line. The name was originally rejected by GNB in 1975 and much later assigned by GNB. Ref: Government Gazette, 29th September 2006. Derailment Hill is located 1.4km near due south of Mount Norris and has a height of 994m. This hill is on top of a small spur, which in turn is on the southern side of Railmotor Ridge.