An encyclopedia on narrow gauge by George W. Hilton. If you are into narrow gauge in general and want to only have one book, this is your answer. A lot of information for one volume. Yes you have a listing and informational text on all the narrow gauge lines by state but there is much more. There is a section on why the narrow movement started and ended, on narrow gauge locomotive development, narrow gauge rolling stock development, change of gauge freight transfer solutions and how the narrow gauge track work was done. A lot of text on many pages with at least one picture on most pages.