Some trains are maintained solely for sightseeing and tourism purposes. That is the case with the Durango & Silverton Narrow Gauge Railroad in Colorado. This old-fashioned, narrow gauge line stretches for 45 miles and gains nearly 3,000 feet in elevation during its journey. Yes, the cowboy-era rail cars and steam engines make the Durango train a unique experience, but it is the views from the windows that make this ride a truly amazing trip. Colorado's snow-capped 14,000-foot peaks dominate the panoramas as the train chugs upward at the low speed of 18 mph. Adventure-minded travelers can add a day to their trip and ride the alpine zip-lines and experience the other outdoor attractions in and around Silverton.