Union Pacific's annual Cheyenne Frontier Days train lays over at Union Station in Denver on July 16, 1998.

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An eastbound UP coal train leaves East Portal siding on October 4, 2011.

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On October 4, 2011, a westbound UP coal empty passes through Tolland, Colorado, on the climb to the Moffat Tunnel, amid the color of autumn

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A Union Pacific empty coal trains heads north at Bill, Wyoming at sunrise on May 30, 2009.

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Westbound Union Pacific freight MNYRO passes through 63-foot Tunnel 40 between Azure and Radium, Colorado, on November 3, 2010.

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