A rail-fan favorite, Colorado Narrow Gauge shows the trains that once traversed the narrow gauge rails, serving the Centennial state s mountain communities and their mines from the 1800s into the mid-1900s. (14 - 22 inches, open). Tide-mark press has been publishing quality calendars for over 35 years. Search for these 12 Tide-mark train calendars: Baltimore & Ohio Colorado Narrow Guage Great Northern Railway Great Trains Howard Fogg Milwaukee Road Pennsylvania Railroad Railroading! Remarkable Steam Trains Santa Fe Shortline Railroads Union Pacific