The GE B23-7 is a diesel locomotive

Diesel locomotive

A diesel locomotive is a type of railroad locomotive in which the prime mover is a diesel engine, a reciprocating engine operating on the Diesel cycle as invented by Dr. Rudolf Diesel...

 model that was offered first by GE

GE Transportation Systems

GE Transportation, formerly known as GE Rail, is a division of General Electric. The organization manufactures equipment for the railroad, marine, mining, drilling and energy generation industries. It is based in Erie, Pennsylvania. Locomotives are assembled at the Erie plant, while engine...

 in 1977, featuring a 12 cylinder

Cylinder (engine)

A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work...

 engine. It is 61 ft 2 in long. It competed with the EMD GP38-2

EMD GP38-2

An EMD GP38-2 is a four-axle diesel-electric locomotive of the road switcher type built by General Motors Electro-Motive Division. Part of the EMD Dash 2 line, the GP38-2 was an upgraded version of the earlier GP38...

. General Electric also produced a variant, the BQ23-7

GE BQ23-7

The GE BQ23-7 was a model of diesel locomotive manufactured by General Electric, a variant of the B23-7 built between 1978 and 1979 . Identical to a regular B23-7, but equipped with an enlarged operating cab for accommodating the train crew, thus making a case for eliminating the caboose from the...

, for the Seaboard Coast Line.

Ten Ferrocarriles Nacionales de México

Ferrocarriles Nacionales de México

Ferrocarriles Nacionales de México, was Mexico's state owned railroad company from 1938 to 1998, and prior to 1938 a major railroad controlled by the government that linked Mexico City to the major cities of Nuevo Laredo and Ciudad Juárez on the U.S. border...

 B23-7s #9130-9139 were built by GE de Brazil in December 1979. A total of 17 B23-7s were built from GE kits in Mexico as Ferrocarriles Nacionales de México

Ferrocarriles Nacionales de México

Ferrocarriles Nacionales de México, was Mexico's state owned railroad company from 1938 to 1998, and prior to 1938 a major railroad controlled by the government that linked Mexico City to the major cities of Nuevo Laredo and Ciudad Juárez on the U.S. border...

 #10047-10052 and #12001-12011.

These engines frequently are rebuilt as Control Car Remote Control Locomotive (CCRCL)

Control Car Remote Control Locomotive

A Control Car Remote Control Locomotive is a stripped diesel locomotive body with remote control equipment installed. The term and the units are a creation of the Union Pacific Railroad, which is widely adopting remote control of locomotives in switching service...

 due to the fact they fetch low prices on the used locomotive market.

Original owners

Railroad	Quantity	Road numbers
Atchison, Topeka and Santa Fe Railway Atchison, Topeka and Santa Fe Railway The Atchison, Topeka and Santa Fe Railway , often abbreviated as Santa Fe, was one of the larger railroads in the United States. The company was first chartered in February 1859...	69	6350-6418
Conrail	141	1900-2023, 2800-2816
Ferrocarriles Unidos del Sureste Ferrocarriles Unidos del Sureste Ferrocarriles Unidos del Sureste was a company that operated a railroad in southeastern Mexico. In the 1930s the Mexican government decided to build a railroad into the Yucatán, connecting the national system with the isolated Ferrocarriles Unidos de Yucatán. The project was completed in 1950 and...	3	522-524
Louisville and Nashville Railroad Louisville and Nashville Railroad The Louisville and Nashville Railroad was a Class I railroad that operated freight and passenger services in the southeast United States.Chartered by the state of Kentucky in 1850, the L&N, as it was generally known, grew into one of the great success stories of American business...	15	5115-5129
Missouri Pacific Railroad Missouri Pacific Railroad The Missouri Pacific Railroad , also known as the MoPac, was one of the first railroads in the United States west of the Mississippi River. MoPac was a Class I railroad growing from dozens of predecessors and mergers, including the St. Louis, Iron Mountain and Southern Railway , Texas and Pacific...	85	2289-2358, 4670-4684
Ferrocarriles Nacionales de México Ferrocarriles Nacionales de México Ferrocarriles Nacionales de México, was Mexico's state owned railroad company from 1938 to 1998, and prior to 1938 a major railroad controlled by the government that linked Mexico City to the major cities of Nuevo Laredo and Ciudad Juárez on the U.S. border...  SMT	8	1-01 - 1-08
Ferrocarriles Nacionales de México Ferrocarriles Nacionales de México Ferrocarriles Nacionales de México, was Mexico's state owned railroad company from 1938 to 1998, and prior to 1938 a major railroad controlled by the government that linked Mexico City to the major cities of Nuevo Laredo and Ciudad Juárez on the U.S. border...	114	9130-9180, 10001-10052, 12001-12011
Providence and Worcester Railroad Providence and Worcester Railroad The Providence and Worcester Railroad is a Class II railroad in the United States. The railroad connects from Gardner in central Massachusetts, south through its namesake cities of Worcester and Providence, Rhode Island, and west from Rhode Island through Connecticut and into New York City...	1	2201
Seaboard Coast Line Railroad Seaboard Coast Line Railroad The Seaboard Coast Line Railroad was a former Class I railroad company operating in the Southeastern United States beginning in 1967. Its passenger operations were taken over by Amtrak in 1971...	29	5100-5114, 5140-5153
Southern Pacific Railroad Southern Pacific Railroad The Southern Pacific Transportation Company , earlier Southern Pacific Railroad and Southern Pacific Company, and usually simply called the Southern Pacific or Espee, was an American railroad....	15	5100-5114
Southern Railway Southern Railway (US) The Southern Railway is a former United States railroad. It was the product of nearly 150 predecessor lines that were combined, reorganized and recombined beginning in the 1830s, formally becoming the Southern Railway in 1894...	54	3970-4023
Texas Utilities	3	3304, 3306, 3307