List of low-emissions locomotives in North America
The following is a list of diesel-electric locomotives that meet or exceed EPA Tier 2 locomotive emissions regulations, sorted by builder. This is a non-exhaustive list of locomotives in North America. Furthermore, green/clean energy is an always developing sector and that more locomotives may be added to the list, while some will no longer meet current standards.
Brandt Road-Rail
Brandt Road-Rail is a company that mainly produces road–rail vehicles, especially railcar movers and maintenance of way equipment.In addition, in 2006, it also built a single prototype genset locomotive.
| Model designation | Wheel arrangement | Build year | Total produced | Power output | # of engines | Engine type | Image |
| Prototype | B-B | 2006 | 1 | 3 | John Deere 6135H |
Integral dx
Integral dx, Inc. is a company in Montevideo, Minnesota that builds a variety of industrial equipment, including spray pavers, concrete mixers, and railroad vehicles. Since 2023, it has been manufacturing Tier 4-compliant switchers for the US Armed Forces. These switchers are usually powered with Caterpillar engines, though Cummins-equipped variants are also offered.| Model designation | Wheel arrangement | Build year | Total produced | Power output | # of engines | Engine type | Image |
| SWM9 | B-B | 2024-present | Several for the US Navy | Caterpillar C9.3B | 2 | ||
| SWR10 | B-B | Offered | Caterpillar C13B | 2 | |||
| SWF10 | B-B | Offered | - | Caterpillar C13B | 2 | - | |
| SWR16 | B-B | Offered | Caterpillar C18 | 2 | |||
| SWF16 | B-B | Offered | - | Caterpillar C18 | 2 | - | |
| SWR18 | B-B | 2025-present | At least one for the US Air Force | Caterpillar C27 | 2 | ||
| SWF18 | B-B | Offered | - | Caterpillar C27 | 2 | - | |
| SWR21 | B-B | Offered | Caterpillar C27 | 2 | |||
| SWF21 | B-B | Offered | - | Caterpillar C27 | 2 | - |
Motive Power and Equipment Solutions
Motive Power and Equipment Solutions was a locomotive manufacturer and rebuilder active in Greenville, South Carolina from 1999 until 2022. This company is not to be confused with MotivePower.| Model designation | Wheel arrangement | Build year | Total produced | Power output | # of engines | Engine type | Image |
| MP-900 | B-B | 1999–2022 | 2 | Cummins QSX15 Tier 2 | |||
| MP-900 | B-B | 2009–2022 | 2 | Cummins QSX15 Tier 3 | |||
| MP-900 | B-B | 2012–2022 | 2 | Cummins QSX15 Tier 4 | |||
| MP-1200 | B-B | 2012–2022 | 2 | Cummins QSX15 Tier 4 | |||
| MP-1500 | B-B | 2007–2022 | 2 | Cummins QSX19 Tier 3 | |||
| MP-1500 "Greenville" | B-B | 2014–2022 | 2 | Cummins QSK19 Tier 3 with CNG/Diesel Dual Fuel | |||
| MP550-B1 | B-B | 2013 | At least 1 | 1 | Cummins QSX15 Tier 3 | ||
| MP2000NG | B-B | 2018-2020 | 2 | ? |
[Railpower Technologies]
[Siemens Mobility]
| Model designation | Wheel arrangement | Build year | Total produced | Power output | # of engines | Engine type | Image |
| Siemens Charger | B-B | 2016–present | 392 | , , | 1 | Cummins QSK95 |
Vehicle Projects
In 2009, a company called Vehicle Projects, in cooperation with BNSF Railway, rebuilt one Railpower GG20B locomotive into a prototype hydrogen-powered locomotive, called an HH20B.| Model designation | Wheel arrangement | Build year | Total produced | Power output | # of engines | Engine type | Image |
| HH20B | B-B | 2009 | 1 | 0 | Hydrogen fuel cell |