Railroad photograph
Photo by: Kevin Morgan
A look at the engineer's side...such as it is, considering there is no cab...of this SD45-2B. It was pretty fantastic seeing a unit wearing Santa Fe blue and yellow in 2025. Particularly a unit as unique as this one! These B-units were not built by EMD, but were modifications made by Santa Fe. Santa Fe removed the cabs and created the B-units. A total of eight such B-units were created from SD45-2s.

One thing worth noting is that some people confuse a B-unit with a slug. A slug has no prime mover, but still has traction motors with power for the motors supplied by other units in its consist. A B-unit still has its prime mover, but simply has no cab and therefore cannot be controlled unless in an MU-consist with other units.
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Wednesday, November 26, 2025 at 13:45:21
image date



Location Information

City or County and State
Denver, CO

Subdivision
Yard Shots

Milepost or Control Point
BNSF Engine House




Train Information
Railroad
SPTX
Model
SD45-2B
Primary Unit Number
SPTX 5703

Paint Scheme
ATSF Blue and Yellow
Symbol
Train Type
Light Power

Primary Unit Past Number(s)
ex-BNSF 6522 / nee-ATSF 5703



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

Focal Length
70 mm
Shutter
1/100 seconds
Aperture
f/2.8