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SP X-1 Narrow Gauge Locomotive

Southern Pacific Railroad Narrow Gauge X-1 450 HP 50 Ton Locomotive

SPRR Narrow Gauge X-1 Locomotive

During the final days of Southern Pacific's narrow gauge operations, the company augmented its roster of aging steam power with a relatively modern diesel. A 50 Ton standard gauge GE switcher was re-gauged to 36" and sent out to desert duty. Numbered "X-1" and sometimes referred to as the "Little Giant," this unit came to dominate its operating area.

This loco models a Southern Pacific Railroad (SPRR) X-1, narrow-gauge, 450hp, 50-ton, Caterpillar diesel made by General Electric and was also known as the "Little Giant". It served the SPRR from 1954 until 1960 in the Owens Valley area. It then went to a mining company in Mexico. The E Scale version of this locomotive is powered by 8 golf cart batteries, and uses a sophisticated electronics system that automatically adjusts power for changes in grade in order to maintain a given speed (+/- about 10%). It also regeneratively charges the batteries while braking.

RMI offers this muscular unit in two scales (2.5" and "E" Scale) in either electric or 22 HP gas/propane/diesel/hydraulic versions. Perfect for club or commercial operations. The E scale version may also be ordered for 12 inch gauge track.

X-1 Locomotive Features

SP X-1 Locomotive
  • Solid riveted cab
  • All steel construction
  • Axle-mounted, heavy duty industrial gear boxes
  • 5/8 hp, continuous-duty, 4-brush 24Vdc motors
  • Solid-state programmable control and power modules
  • Options:


Man vs SP X-1 Locomotive Size Comparison

SP X-1 Locomotive Rear View

SP X-1 Locomotive Specifications
Standard Features BB Electric BB Gas/Hydr
Number of 5/8 HP motors 4  
Powered Axles 4 4
Power Module Rating 160 Amp  
Battery Positions 8 golf cart batteries  
Length 78" 78"
Width 22.5" 22.5"
Height 31" 31"
Approx. Wt. w/o Batteries    
Approx. Wt. w/ Batteries    
    Also available as a diesel, propane or gas/hydraulic unit powered by a water-cooled Kubota 22 hp electric-start engine and hydrostatic transmission.
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