Photo By: Kevin Morgan
 

Both P42s on the westbound Zephyr are kicking up some exhaust as the train climbs the roughly 2% grade to Big Ten Curve. In the distance, on the main at Eisele (Clay), an eastbound UP coal train is waiting for the arrival of the Zephyr. Indeed, if you are unfamiliar with the geography and layout of the tracks here, welcome to the interesting engineering of Big Ten Curve!
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Thursday, August 06, 2026 at 9:35:53 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 206

Paint Scheme
Amtrak Phase 5b
Symbol
AMT5-05
Train Type
California Zephyr (Amtrak)



Photo Information
Camera Make/Model
DJI / Mavic 3 Pro [FC4370]
ISO
100
890
Flash
Did Not Fire

Focal Length
166 mm
Shutter
1/500 seconds
Aperture
f/3.4


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