Photo By: Kevin Morgan
 

The clouds were truly dramatic and dynamic, amplified by evening sunlight, as the eastbound Zephyr descends from Big Ten Curve and approaches a green signal at the west end of Rocky. One of the P42DCs...not sure which one...developed some mechanical issues on Donner Pass the previous day, and a UP loaner unit was added to assist.
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Sunday, May 03, 2026 at 6:36:45 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
Hasselblad / Mavic 3 / Mavic 3 Pro [L2D-20c]
ISO
100
898
Flash
Did Not Fire

Focal Length
24 mm
Shutter
1/500 seconds
Aperture
f/2.8


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