Since its founding in 1858, the Denver metro area has seen a number of different industries come and go, some significantly more prosperous than others. One of the most popular and booming fields in the city’s history is that of the railroad, which can be seen in these 13 rare photos via our friends at History Colorado. Let’s take a look:

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For even more Denver history, click on This Is What Denver Looked Like 100 Years Ago…It May Surprise You.

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