"Narrow Gauge in the Rockies" by Lucius Beebe & Charles Clegg is a book written in English that focuses on the model railroads and trains in the Rocky Mountains. It is a comprehensive guide for enthusiasts interested in narrow gauge railways and provides detailed information on the history, operation, and construction of these unique systems. The authors offer valuable insights and tips for collectors and hobbyists looking to enhance their own model railroad layouts inspired by the scenic beauty of the Rockies.