| The Denver and Rio Grande Railroad generally referred to as the Rio Grande, became the Denver and Rio Grande Western Railroad in 1920, and is today absorbed into a larger system, the Union Pacific. The D&RGW served mainly as transcontinental bridge line between Denver, Colorado, and Salt Lake City, Utah, and a major origin of coal and mineral traffic with a motto of Through the Rockies, not around them. The Rio Grande was the epitome of mountain railroading, operating the highest mainline rail line in the Untied States of over 10,240 feet at Tennessee Pass in Colorado and the famed routes through the Moffat Tunnel and the Royal Gorge. At its height around 1890, the D&RG had the largest operating narrow gauge railroad network in North America. Known for its independence, the D&RGW operated the last private long haul passenger train in the United States, the Rio Grande Zephyr.
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