Greenberg's Guide to Lionel Trains 1901-1942, Volume II: O and OO Gauges provides an essential analytic framework for collectors and hobbyists. This second edition by Bruce C. Greenberg, Ph.D., features 178 photos, 8 illustrations, and 64 tables to help date, identify, and value prewar Lionel production. Chapters cover electric and diesel locomotives, steam locomotives, freight cars, passenger cars, and specialized OO gauge trains. Published by Kalmbach Books, this comprehensive reference includes market values and detailed technical specifications for identifying original versus post-factory alterations.