Photo By: Kevin Morgan
 

Colorado typically has clear skies in the mornings in the summer. However, a cold front is starting to move in, and some clouds are gathering over the mountains this morning as the westbound Zephyr climbs the north edge of Big Ten Curve.
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Tuesday, August 11, 2026 at 9:43:45 AM
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
Model
P42DC
Primary Unit Number
AMTK 45

Paint Scheme
Amtrak Phase 5b
Symbol
AMT5-10
Train Type
California Zephyr (Amtrak)



Photo Information
Camera Make/Model
Hasselblad / Mavic 3 / Mavic 3 Pro [L2D-20c]
ISO
100
900
Flash
Did Not Fire

Focal Length
24 mm
Shutter
1/1600 seconds
Aperture
f/2.8


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