| NRE 3GS21C | |
| Powertype: | Diesel-electric |
| Builder: | National Railway Equipment (NRE) |
| Builddate: | - Present |
| Buildmodel: | 3GS21C |
| Cylindercount: | 6 (×3) |
| Primemover: | Cummins QSK19C (×3) |
| Enginetype: | Diesel engine (×3) |
| Aspiration: | Turbocharger (×3) |
| Poweroutput: | 2100hp |
| Totalproduction: | 27 |
The NRE 3GS21C is a low-emissions diesel genset locomotive built by National Railway Equipment (NRE). It is powered by three Cummins QSK19C I6 engines with each one developing 700hp and creating a total power output of 2100hp. Instead of a single prime mover, the NRE genset locomotive has three engines that each can be turned off or on as power is needed reducing overall diesel emissions and improving fuel efficiency.[1] At least 27[2] [3] 3GS21C genset locomotives have been produced to date at NRE's Mount Vernon shops in Southern Illinois.[4]
| Railroad | Quantity | Road numbers | Notes |
|---|---|---|---|
| 16 | 1300-1316[5] | ex-GN and ex-ATSF EMD SD40, SD45 and SD45-2 | |
| 3 | 2000-2002[6] | ex-UP EMD SD24B | |
| 1 | 3850[7] | Built in 2008. Ex-Norfolk Southern 3188 EMD SD40[8] | |
| 2 | 80-81[9] | The first 3GS21C built, in Jan. 2008[10] | |
| 4 | 2160-2163[11] | 2012 | |
| 1 | 1600[12] | ||
| Total | 27 | ! | |
Because the engines are modular, flexibility is obtained: