ColoradoRailfan.com Contemporary Railfanning in Colorado
Railroad photograph
Photo by: Kevin Morgan
UP 4014, the Big Boy is 132 feet and 9 inches in length. It was built by the American Locomotive Company (ALCO) in 1941. A total of 25 Big Boys were built for Union Pacific between 1941 and 1944.
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Thursday, July 17, 2025 at 14:32:21
image date


Location Information

City or County and State
Denver, CO

Subdivision
Limon (UP)

Milepost or Control Point
MP 637.6 (Pullman)



Train Information
Railroad
Union Pacific 		Model
4-8-8-4 		Primary Unit Number
UP 4014

Paint Scheme
Steam 		Symbol
PCYDV-17 		Train Type
Steam Train

Photo Information
Camera Make/Model
Canon / Canon EOS R6m2 		ISO
200
Flash
Did Not Fire

Focal Length
24 mm 		Shutter
1/400 seconds 		Aperture
f/8