The Brookville BL20GH is a diesel-electric locomotive built by the Brookville Equipment Corporation. It utilizes a V12

V12 engine

A V12 engine is a V engine with 12 cylinders mounted on the crankcase in two banks of six cylinders, usually but not always at a 60° angle to each other, with all 12 pistons driving a common crankshaft....

 MTU-Detroit Diesel

MTU Friedrichshafen

MTU Friedrichshafen GmbH is a manufacturer of commercial internal combustion engines founded by Wilhelm Maybach and his son Karl Maybach in 1909...

 12V4000 engine rated at 2,250 horsepower. The locomotive is designed for switching and work train duty, but is also equipped with an I6 Caterpillar

Caterpillar Inc.

Caterpillar Inc. , also known as "CAT", designs, manufactures, markets and sells machinery and engines and sells financial products and insurance to customers via a worldwide dealer network. Caterpillar is the world's largest manufacturer of construction and mining equipment, diesel and natural gas...

 C15 engine for head end power

Head end power

Head end power or electric train supply is a rail transport term for the electrical power distribution system on a passenger train. The power source, usually a locomotive at the front or “head” of a train or a generator car, generates all the electricity used for lighting, electrical and other...

, allowing the locomotive to be used in passenger service for branch line shuttle trains.

These locomotives are used in branch service on the Metro-North Railroad

Metro-North Railroad

The Metro-North Commuter Railroad , trading as MTA Metro-North Railroad, or, more commonly, Metro-North, is a suburban commuter rail service that is run and managed by the Metropolitan Transportation Authority , an authority of New York State. It is the busiest commuter railroad in the United...

.

The BL20GH is a low emissions locomotive.