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

EMD SD22ECO

The EMD SD22ECO is a C-C diesel-electric locomotive rebuilt by Electro-Motive Diesel. It is, along with the GP22ECO, primarily the application of a conversion kit to an existing EMD SD40-type locomotive. This involves replacing the existing prime mover with an EPA Tier-II-compliant turbocharged...

, primarily the application of a conversion kit to an existing EMD GP40

EMD GP40

The EMD GP40 is a 4-axle diesel-electric road switcher locomotive built by General Motors Electro-Motive Division between November 1965 and December 1971...

 or EMD GP38*-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.

(*Norfolk Southern has experimented with a GP38AC to convert it into a GP22ECO by doing so it altered it's appearance to look like a GP40.)

This conversion does not alter the external appearance of the locomotive. Like the earlier GP15-1

EMD GP15-1

The EMD GP15-1 is a 4-axle diesel locomotive built by General Motors Electro-Motive Division between June, 1976 and March, 1982. Intended to provide an alternative to the rebuilding programs that many railroads were applying to their early road switchers, it is generally employed as a yard switcher...

, GP15AC

EMD GP15AC

An EMD GP15AC is a 4-axle diesel locomotive built by General Motors Electro-Motive Division between November and December 1982. This locomotive differs from the otherwise identical EMD GP15-1 due to Missouri Pacific specifying new AR10 AC alternators instead of rebuilt D32 DC generators...

 and GP15T

EMD GP15T

An EMD GP15T is a 4-axle diesel locomotive built by General Motors Electro-Motive Division between October 1982 and April 1983. It was a very close cousin to the GP15-1, but used a turbocharger in order to generate more power from a smaller engine...

, the GP22ECO offers customers a 'factory' upgrade of existing locomotives.

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.

External links

• Railroad Picture Archives – Photographs of the EMD GP22ECO.