NRE 3GS21C

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 700 hp and creating a total power output of 2100 hp. 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. At least 27 3GS21C genset locomotives have been produced to date at NRE's Mount Vernon shops in Southern Illinois.

Flexibility
Because the engines are modular, flexibility is obtained:


 * If one engine fails, the others can continue at reduced power.
 * If a lower axle load is needed, one engine can be left off.
 * When reduced power is needed, one or more of the engines can be turned off, saving fuel and wear and tear.
 * The QSK19C engine is common to the four variants of the NRE 3GS21C locomotive.
 * The QSK19C engine is widely used for non-railway applications, and spare parts are readily available.