Book excerpt: A charming mix of how-to, RR love and operation. Short of the "bible," Armstong's The Railroad--What It Is..., this is the best work on the history, development, use and function of track, rolling stock, signals that we've found outside the textbooks. Jargon is explained (including a 45 p. glossary). Fine, fun, informative book. Published by Sand River Press, 1319 14th Street, Los Osos, CA 93402. Annotation copyright by Book News, Inc., Portland, OR