NRE NF40-3

The  is a low-emissions four-axle diesel-electric locomotive for commuter trains, built by.

The NF40-3 units are rebuilt and refurbished from units, most of which formerly operated for. Inside the unit, the EMD 645E3 prime mover has been replaced with two Cummins QSK50L V16 engines rated at 1,800 horsepower (1,340 kW) each, for a total power output of 3,600 horsepower (2,680 kW). The electronics have been upgraded using the same equipment as NRE's N-ViroMotive line, and a new cab similar to those found on 's series and the  replaces the original cab. The NF40-3's new cab was designed by Cesar Vergara, who also designed the, the MPXpress series and the BL36PH.

The launch customer was MARTA Commuter Rail in, who received 5 initial units rebuilt from ex-Amtrak F40PHs in 2015. Three additional units rebuilt from ex-Pandrol-Jackson F40PH variants were delivered the following year, and an additional five were delivered in 2017.