The EMD SD22ECO is a 2150 hp C-C diesel-electric locomotive rebuilt by Electro-Motive Diesel. It is, along with the GP22ECO

EMD GP22ECO

The EMD GP22ECO is a B-B diesel-electric locomotive rebuilt by Electro-Motive Diesel. It is, along with the SD22ECO, primarily the application of a conversion kit to an existing EMD GP40 or EMD GP38*-type locomotive. This involves replacing the existing prime mover with an EPA Tier-II-compliant...

, primarily the application of a conversion kit to an existing EMD SD40

EMD SD40

The EMD SD40 is a 6-axle diesel locomotive built by General Motors Electro-Motive Division between January 1966 and August 1972.-Design:Like its predecessor in EMD's catalog, the SD35, the SD40 is a high-horsepower, six-motor freight locomotive....

-type locomotive. This involves replacing the existing prime mover

Prime mover (locomotive)

In engineering, a prime mover is an engine that converts fuel to useful work. In locomotives, the prime mover is thus the source of power for its propulsion. The term is generally used when discussing any locomotive powered by an internal combustion engine...

 with an EPA

United States Environmental Protection Agency

The U.S. Environmental Protection Agency is an agency of the federal government of the United States charged with protecting human health and the environment, by writing and enforcing regulations based on laws passed by Congress...

 Tier-II-compliant turbocharged V8

V8 engine

A V8 engine is a V engine with eight cylinders mounted on the crankcase in two banks of four cylinders, in most cases set at a right angle to each other but sometimes at a narrower angle, with all eight pistons driving a common crankshaft....

 710G3A

EMD 710

The EMD 710 is a line of diesel engines built by Electro-Motive Diesel . The 710 series largely replaced the earlier EMD 645 series. The EMD 710 is a large two-stroke diesel engine that has a displacement per cylinder. Since its introduction, EMD has continually upgraded the 710G diesel engine...

, 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.

This conversion does not alter the external appearance of the locomotive.

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.

External links

• Railroad Picture Archives – Photographs of the EMD SD22ECO.