NRE 3GS21B

NRE 3GS21B
A new NRE 3GS21B locomotive in the Union Pacific scheme.
Type and origin Power type Diesel-electric Builder National Railway Equipment (NREC) Model 3GS21B Build date December 2006 (2006-12) – Present Total produced 182
Specifications Gauge 4 ft 8+1⁄2 in (1,435 mm) Prime mover Cummins QSK19C (×3) Engine type Diesel engine Aspiration Turbocharger Cylinders 6 (×3)
Performance figures Power output 2,100 hp (1,570 kW)
Career Operators See list

The NRE 3GS21B 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 3GS21B 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

Railroad	Quantity	Road numbers	Notes
BNSF Railway	72	1220-1294	1293-1294 equipped with dynamic brakes, classified as 3GS21B-DE
California Northern Railroad	5	501-505
Canadian Pacific	2	2100-2101	Both units equipped with dynamic brakes, classified as 3GS21B-DE, 2100 retired 5/13, 2101 retired 6/13 (both returned to NRE).
CSX Transportation	16	1300-1316
Massachusetts Bay Transportation Authority	2	3248-3249	Both units equipped with dynamic brakes, classified as 3GS21B-DE
Metro Stevedore	1	805	Equipped with dynamic brakes, classified as 3GS21B-DE
Neptune Bulk Terminals	2	805-805A, 808-808A, 809-809A	805A, 808A and 809A are the only road slug model built to date.
Norfolk Southern	2	300-301
Nova Chemicals	2	9120-9121
National Railway Equipment	7	2008-2009, 2011, 2013–2015, & 2020	Demonstration Units
Pacific Harbor Line	4	30-31 & 33-34
Tacoma Rail	1	2100
Union Pacific	59	Y2701-Y2760
United States Army	7	6500-6506
San Diego and Imperial Valley Railroad	2	SDIY 701-702
Total	182

• 
  A brand new 3GS21B locomotive painted for the BNSF Railway.
• 
  An NRE 3GS21B leads a Union Pacific train along street running trackage at Anaheim, California.
• 
  Two brand new U.S. Army 3GS21B locomotives working at Fort Lewis, Washington.
• 
  Brand new MBTA 3GS21B at South Station.
• 
  MBTA 3GS21B on the Grand Junction Railroad.

See also

• NRE 3GS21C

External links

External images
RailPictures.Net – NRE 3GS21B photographs from RailPictures.Net.
Railroad Picture Archives – Photographs of the NRE 3GS21B at Railroad Picture Archives.

• National Railway Equipment – Official N-ViroMotive Product Page