The EMD GP20C-ECO is a 2,000-horsepower (1,500 kW) B-B diesel-electric locomotive built by EMD. Although similar to the EMD GP22ECO, the GP20C-ECO follows Canadian Pacific's request for crashworthiness and EPA emission standards with the "C" in the designation denoting crashworthiness of the cab, frame, and fuel tank. Canadian Pacific (CP) requested relaxed emission standards (Tier 0+ instead of Tier 2) to cut costs.

EMD GP20C-ECO
3 GP20C-ECOs lead a potash train near Lake City, Minnesota, US
Type and origin Power type Diesel-electric Builder Electro-Motive Diesel Model GP20C-ECO Build date 2013 Total produced 130
Specifications Configuration: ​  • AAR B–B  • UIC Bo′Bo′ Gauge 4 ft 8+1⁄2 in (1,435 mm) Prime mover EMD 8-710G3A Engine type V8 diesel engine Aspiration turbocharged Displacement 710 cubic inches (11.6 liters) per cylinder Cylinders 8
Performance figures Power output 2,000 hp (1,490 kW)
Career Numbers 2200–2329 Locale North America Current owner Canadian Pacific Railway
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GP20C-ECOs use just enough rebuilt components to designate them a rebuild. The GP20C-ECOs feature a new frame, fuel tank, long hood, and cab with CP providing trucks, and alternator (along with many other smaller components), mainly from retired CP GP9s, that are rebuilt and reused in the locomotives. The units resemble a GP60's long hood and feature a snoot nose, which set the cab back slightly on the frame to make room for the additional length. As with the SD30C-ECOs, the GP20C-ECOs have all-LED lighting with the exception of the headlights and ditch lights.

The GP20C-ECOs should not be confused with a limited number of "GP20C" locomotives. These were former Great Northern GP20s rebuilt by Ziegler in 1989 (Ziegler was a Minneapolis-based Caterpillar dealer). The C in the name referred to their new Caterpillar engines. Only ten of these locomotives were produced. ^[2]