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,[1] 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
Type and origin
Power typeDiesel-electric
BuilderElectro-Motive Diesel (EMD)
  AARB-B (UIC: Bo'Bo' )
Gauge4 ft 8 12 in (1,435 mm)
Prime moverEMD 8–710G3A–T2
Performance figures
Power output2,150 hp (1,600 kW)

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

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.


  1. Trains: 24. July 2008. Missing or empty |title= (help)

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.