A Union Pacific coal train follows a bend in the Colorado River between Yarmony and Radium, Colorado, on November 7, 2012.

An eastbound coal train snakes into Azure, Colorado, on November 7, 2013. Mid-train DPUs Nos. 6206, 6838, and 7174 are approaching the west switch of the siding, while lone DPU No. 5818 bunches up... (more)

A Union Pacific coal train is approaching Azure, Colorado, on November 7, 2012. The DPU of the train has just exited 294-foot Tunnel 39 and is leaving the confines of Little Gore Canyon.

UP 5818 pops out of Shed 10 heading west to Oakland

Meet with BNSF 843 East, 5818 is rear helper