Photo By: Kevin Morgan
 

The eastbound Zephyr is descending Big Ten Curve with a UP ES44AC on the head end. Hit the jackpot with the storm lighting this evening as there was a thin section of sky to the west between the clouds and the mountains, allowing the sun to light up the scene. The UP unit was added after mechanical issues developer with one of the P42DCs on Donner Pass.
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Sunday, May 03, 2026 at 6:36:24 PM
image date



Location Information
City or County and State
Arvada, CO

Subdivision
Moffat Tunnel (UP)

Milepost or Control Point
Big Ten Curve (MP 19.5 to MP 20.2)




Train Information
Railroad
Amtrak, Union Pacific
Model
ES44AC
Primary Unit Number
UP 7364

Paint Scheme
UP Flag/Lightning/Wings
Symbol
AMT6-02
Train Type
California Zephyr (Amtrak)



Photo Information
Camera Make/Model
DJI / Mavic 3 Pro [FC4382]
ISO
100
886
Flash
Did Not Fire

Focal Length
70 mm
Shutter
1/320 seconds
Aperture
f/2.8


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