TWO Major Manufactures of Locomotives:

1. General Motors Electro-Motive Division (GM-EMD) now owned by Caterpillar and called  Electro-Motive Diesel, Inc., also referred to as "EMD", is owned by Caterpillar through its wholly owned subsidiary Progress Rail Services Corporation. The company designs, manufactures and sells diesel-electric locomotives and diesel power engines under the Electro-Motive Diesel brand.[2] EMD offers an extensive range of locomotive products in the rail industry.[3]

Electro-Motive Diesel, Inc. traces its roots to the Electro-Motive Engineering Corporation, founded in 1922. In 1930, General Motors Corporation purchased the Winton Engine Co. and Winton's primary customer of gasoline engines, the Electro-Motive Company (a gasoline-electric car manufacturer), combining the two to form GM's Electro-Motive Division (EMD) on January 1, 1941.

In 2005, GM sold EMD to Greenbriar Equity Group LLC and Berkshire Partners LLC, which formed Electro-Motive Diesel, Inc., to facilitate the purchase. On August 2, 2010, Progress Rail Services Corporation completed the purchase of Electro-Motive Diesel, Inc. from Greenbriar, Berkshire, et al. making Electro-Motive Diesel, Inc. a wholly owned subsidiary of Progress Rail Services Corporation, a subsidiary of Caterpillar Inc.

EMD's headquarters, engineering facilities and parts manufacturing operations are physically located in McCook, Illinois.[note 1] EMD's final assembly operations were located in London, Ontario, Canada, until the plant's closure in February 2012; a new assembly site was opened in late 2011 in Muncie, Indiana. EMD operates a traction motor maintenance, rebuild and overhaul facility in San Luis Potosí, Mexico.

As of 2008, EMD employed approximately 3,260 people.[4] In 2010 EMD held approximately 30 percent of the market for diesel-electric locomotives in North America.[5]
The American Locomotive Company, often shortened to ALCO, ALCo or Alco, designed, built and sold steam locomotives, diesel-electric locomotives, diesel engines and generators, specialized forgings, high quality steel, armed tanks and automobiles and produced nuclear energy. The American Locomotive Company was formed in 1901 by the merger of Schenectady Locomotive Engine Manufactory of Schenectady, New York with seven smaller locomotive manufacturers.

2. ALCO American Locomotive Company
Industry
Manufacturing
Energy generation
Predecessor
Brooks Locomotive Works
Cooke Locomotive and Machine Works
Dickson Manufacturing Company
Manchester Locomotive Works
Pittsburgh Locomotive and Car Works
Rhode Island Locomotive Works
Richmond Locomotive Works
Schenectady Locomotive Works
Founded Schenectady, New York, United States (1901)
Defunct 1969
Headquarters Schenectady, New York, United States
Products
Steam locomotives
Diesel-electric locomotives
Diesel engines and generators
Specialized forgings
High quality steel
Armed tanks
Automobiles
Electricity
Subsidiaries
Montreal Locomotive Works
Rogers Locomotive Works

The American Locomotive Automobile Company subsidiary designed and manufactured automobiles under the Alco brand from 1905-1913 and produced nuclear energy from 1954-1962. The company changed its name to Alco Products, Incorporated in 1955. In 1964 the Worthington Corporation acquired the company. The company became defunct in 1969.[1]