Churchward's 2 cylinder Saint Class 4-6-0s were arguably one of the most important locomotive developments of the twentieth century. The seventy-seven members of the class were so successful that most of the other railway companies in this country used the same 2 cylinder 4-6-0 formula in the design of their own mixed traffic locomotives. Over the years the Saints saw a number of modifications, with many of the class passing into BR ownership. The...