EMD GP22ECO

The EMD GP22ECO is a 2,150 hp (1,600 kW) B-B 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.

EMD GP22ECO
KCS #2820 post-rebuild with a "Retro Belle" paint job
Type and origin Power type Diesel-electric Builder Electro-Motive Diesel (EMD)
Specifications Configuration: ​  • AAR B-B (UIC: Bo'Bo' ) Gauge 4 ft 8+1⁄2 in (1,435 mm) Prime mover EMD 8–710G3A–T2 Cylinders V8 Transmission Diesel-electric
Performance figures Power output 2,150 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.