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Union Pacific No. UPY 2733, an NRE 3GS-21B street running on Olive Street, Anaheim, California.

By Morven [GFDL ( or CC BY-SA 3.0  (], from Wikimedia Commons​

NRE 3GS-21B Diesel-Electric Locomotive
The NRE 3GS-21B is a low-emissions diesel switcher locomotive built by National Railway Equipment. It is powered by three Cummins QSK19C I6 engines with each one developing 700 horsepower (522 kW) and creating a total power output of 2,100 horsepower (1,570 kW). Having multiple engines instead of a single prime mover, a design referred to as a "Genset," reduces overall diesel emissions and improves fuel efficiency. More than 150 of the 3GS-21B Genset locomotives have been produced to date, with the majority of these units being manufactured at NREC's Mount Vernon shops in Southern Illinois. In addition, three road slug models have also been produced.

Original Buyers

Owner: BNSF Railway
Quantity: 72
Road numbers: 1220-1292

Owner: California Northern Railroad
Quantity: 5
Road numbers: 501-505

Owner: Canadian Pacific
Quantity: 2
Road numbers: 2100-2101
Remarks: 2100 retired May 2013, 2101 retired June 2013 (both returned to NRE).

Owner: CSX Transportation
Quantity: 16
Road numbers: 1300-1316

Owner: Massachusetts Bay Transportation Authority (MBTA)
Quantity: 2
Road numbers: 3248-3249

Owner: Metro Stevedore
Quantity: 1
Road numbers: 805

Owner: Neptune Bulk Terminals
Quantity: 3
Road numbers: 805-805A, 808-808A, 809-809A
Remarks: 805A, 808A and 809A are the only road slug model built to date.

Owner: Norfolk Southern
Quantity: 2
Road numbers: 300-301

Owner: Nova Chemicals
Quantity: 2
Road numbers: 9120-9121

Owner: National Railway Equipment
Quantity: 7
Road numbers: 2008-2009, 2011, 2013-2015, & 2020
Remarks: Demonstration Units

Owner: Pacific Harbor Line
Quantity: 4
Road numbers: 30-31, 33-34

Owner: Tacoma Rail
Quantity: 1
Road numbers: 2100

Owner: Union Pacific
Quantity: 59
Road numbers: Y2701-Y2760

Owner: United States Army
Quantity: 7
Road numbers: 6500-6506

Owner: San Diego and Imperial Valley Railroad
Quantity: 2
Road numbers: SDIY 701-702

Total Units: 182

NRE 3GS-21B Overview
Type and origin
Power type: Diesel-electric
Builder:  National Railway Equipment (NREC)
Model: 3GS-21B
Build date: December 2006 – Present
Total produced: 182

Prime mover: Cummins QSK19C (×3)
Engine type: Diesel engine
Aspiration: Turbocharger
Cylinders: 6 (×3)
AARPlate2: Plate L
Length Over Coupler Pulling Faces: 56'4"
Width Over Grab Irons: 10'9"
Maximum Height Above Rail: 15'8"
Wheel Diameter: 40"
Weight Fully Serviced: 246,000lbs
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Generator Model: 740RDL
Air Compressor Model: GAR37
Air Brake Model: Electronic
Microprocessor Model: NFORCE
Traction Motors: D77/78
Fuel: 1,600gal
Sand: 32 cu ft
Coolant Per N Gen: 28gal
Lubricating Oil Per N Gen: 30gal
Retention Tank: 50-100gal
Performance figures
Power output 2,100 hp (1,570 kW)

See also:

NRE N-ViroMotive Locomotives

Low-Emission Locomotives

Diesel-Electric Locomotives