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BNSF 4258 switching the intermodal yards at Commerce, California, February 15, 2005.
The GE B23-7 is a roadswitcher diesel locomotive model that was first offered by GE in late 1977. Featuring a smaller 12 cylinder version of the FDL engine, it is the successor to GE's U23B produced from early 1968 to mid 1977, but at 62 ft 2 in (18.95 m) long is exactly 2 ft 0 in (0.61 m). longer. It competed with the very successful EMD GP38-2. General Electric also produced a variant, the BQ23-7,  no.5130-5139, for the Seaboard Coast Line. A total of 537 B23-7's were built for 9 U.S. customers and 2 Mexican customers.
A B23-7A is a 12-cylinder B23-7 with horsepower boosted to 250 per cylinder or 3,000 horsepower. In 1980 the Missouri Pacific ordered three B23-7A's (#'s 4667-4669, later UP #'s 257-259) and tested them system-wide. The result was the GE model B30-7A, B30-7 with a 12-cylinder FDL prime mover. They were not renumbered into the B30-7A series on the MP because they lacked Sentry Wheel Slip and had different engine governors.
13 B23-7's were built by GE of Brazil in Dec.1979 for United South Eastern Railways(FUS) no.522-524 and National Railways of Mexico(NdeM) no.9130-9139. 17 B23-7s were built from GE kits in Mexico as Ferrocarriles Nacionales de México no.10047-10052 and no.12001-12011.
Southern Railway's 54 units had Southern's "standard" high-short-hoods.
These engines frequently are rebuilt as Control Car Remote Control Locomotive (CCRCL) due to their low value on the used locomotive market.
|Atchison, Topeka and Santa Fe Railway||69||6350-6418||6405-6418 last B23-7s built
Transferred to BNSF
|Conrail||141||1900-2023, 2800-2816||2800-2816 first B23-7s built|
|Ferrocaril Unidos del Sureste||3||522- 524|
|Louisville and Nashville Railroad (Family Lines)||15||5115-5129||Transferred to CSX|
|Missouri Pacific Railroad||85||2289-2358, 4670-4684||2289-2358 renumbered to 4600-4669
Transferred To Union Pacific
|Ferrocarriles Nacionales de México||122||1-01-1-08, 9130-9180, 10001-10052, 12000-12011|
|Providence and Worcester||1||2201|
|Seaboard Coast Line Railroad (Family Lines)||29||5100-5114, 5130-5139 ( BQ23-7), 5140-5153|
|Southern Railway||54||3970-4023||High Hoods. Sold to NS|
|Southern Pacific Railroad||15||5100-5114|
- Hans Halberstadt (13 September 1996). Modern Diesel Locomotives. MBI Publishing Company. pp. 62–. ISBN 978-0-7603-0199-9. Retrieved 14 April 2010.
- Gerald L. Foster (18 March 1996). A Field Guide to Trains of North America. Houghton Mifflin Harcourt. pp. 46–. ISBN 978-0-395-70112-6. Retrieved 14 April 2010.