Features include: Why some engines came ahead of others, some with super heaters, some without.The many changes and improvements made over the years. Examination of the traffic the 310 engines hauled on many lines in New South Wales.The many problems that affected the locos and the conversion of many 55 class to burn oil.A look at the related K class of the Commonwealth Railways.Written in the authors entertaining and authoritative style.Fully illustrated with over 296 photographs, numerous drawings and diagrams, poems, data tables, full index.