The EMD GP22ECO is a 2,150 hp (1,600 kW) B-B road switcher diesel-electric locomotive rebuilt by Electro-Motive Diesel and Norfolk Southern's Juniata Shops. Initially EMD built two GP22ECO demonstrators, one based on a GP9 and one based on a GP40, but thus far all orders have been for conversions based on EMD GP40 and EMD GP40-2 series locomotives. The rebuild involves replacing the existing prime mover with an EPA Tier-II-compliant turbocharged V8 710G3A, with Electronic fuel injection. The prime mover is mated to an AR10 alternator for traction power, a CA6 alternator for control power, and a computerized control system. Applying this to a 6-axle locomotive, results in a SD22ECO. Some 6-axle locomotives could alternately be converted into a SD32ECO, using a 3,150 hp (2,350 kW) V12 instead.
KCS #2820 post-rebuild with a "Retro Belle" paint job
When applied to GP40 or GP40-2 series locomotives this conversion does not alter the external appearance of the locomotive, although the conversion of the GP9-based demonstrator required extensive changes to the long hood. The GP22ECO offers customers a 'factory' upgrade of existing locomotives.
Norfolk Southern's units were rebuilt from GP38AC units. They also feature electrical, mechanical, and emissions improvements.
Advertised benefits include:
- EPA Tier-II compliance.
- Fuel savings up to 25%.
- Lube oil savings up to 50%.
- Upgradeable software can be tuned for reduced emissions or improved fuel efficiency.
- Microprocessor control offers diagnostics, wheel slip control, and optimal wheel/rail adhesion.
- 184-day maintenance cycle instead of 92-day.
- 15,000 MWh overhaul cycle.
- Reduced maintenance expense due to use of standard 710 prime mover.
- Automatic Engine Start Stop system keeps locomotive ready without wasting fuel.
- Trains: 24. July 2008. Missing or empty
|Wikimedia Commons has media related to EMD GP22ECO locomotives.|
- "Pictures of GP22ECO's in them". Railroad Picture Archives.