Coal Loaded Eastbound Morning light plays with the snow and shadows along the Moffat Road.

After running through Big Ten Curve, UP 6049 winds its way towards Denver through Arvada, Colorado. Here we see the mid-train helper engines as they pass beneath Highway 93.

The Big Ten Curve enables UP 6049 (AC44CWCTE) to drop further in altitude, winding through the 270 degree switchback which keeps the grade change at 2%.

From this vantage point you get a good perspective of the grade change as UP 6049 (AC44CWCTE) drops down from Tunnel #1 and heads to the Big Ten Curve.

UP 6049 (AC44CWCTE) leads a coal train through Big Ten Curve as it drops in elevation towards Arvada, Colorado.

UP 6049 (AC44CWCTE) leads a long coal train down the mountain from Tunnel 1 and has made the 180 degree turn in Coal Creek Canyon as it heads toward the Big Ten curve. Three helper units provide ... (more)

GE's lead UP Train AASFX 22 towards Fairfax Yard on the UP KC Metro Sub. at Hickory Street on a beautiful afternoon accompanied by the KC Skyline.

Locomotives: UP 6049, UP 7140

4-22-15... (more)

Union Pacific GE AC4400CW-CTE No. 6049 operating as a DPU, pushes a westbound coal train into Big 10 Curve west of Rocky, Colorado, on March 25, 2014.

A UP AC4400CW puts all its power to the rail, as it struggles to lift its train over Kirkwood Hill.

Brand-new UP 6049 leads a "baretable" train past Caltrain's Tamien station.

Shiny and new, this units builders plate showed December 2003.

Brand new and shiny, this units builders plate said December 2003.