The career of David Moffat spanned from 1859-1911 and his influence lives on today. He and his efforts offer strategic and tactical lessons. Moffat’s last enterprise was the Denver Northwestern and Pacific Railway Company. It faced many obstacles. Not only was it being built through the heart of the Colorado Rockies, but there were financial and political challenges as well. This road’s story encapsulates the railroad industry in Colorado. The talk starts with a brief review of steam power and railroads in the US, 1809-1862. Colorado was bypassed (except for a few miles through far northeastern Colorado at Julesburg) when the transcontinental railroad was built, 1862-1868. Colorado railroads are traced and examined from 1872-1935. We will trace iron rails as they came to crisscross the state and look at how they made it what it is today. There were scores of Colorado railroad companies. Some focused on logging, some coke manufacturing, others livestock and agricultural work. The focus is on the main lines. They competed to reach and serve the mining camps, trying to dominate general freight and passenger hauling along the way.