GE B23-7

The GE B23-7 is a 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,[1][2] 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.

GE B23-7
BNSF 4258 switching the intermodal yards at Commerce, California, February 15, 2005.
Type and origin
Power typeDiesel-electric
BuilderGE Transportation Systems GE de Brazil
Build dateSEP 1977 DEC 1984
Total producedU.S. - 412 units; Mexico - 125 units.
Gauge4 ft 8 12 in (1,435 mm) standard gauge
1,600 mm (5 ft 3 in), Brazil
Length62 ft 2 in (18.95 m)
Prime moverGE FDL-12
Engine typeV12 diesel
Performance figures
Power output2,250 hp (1,680 kW)

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.

Union Pacific Railroad converted many of their B23-7's into Control Car Remote Control Locomotives by installing remote control equipment and removing the fuel tank and traction motors. This locomotive class (along with the B30-7) were chosen for conversion due to their low value on the used locomotive market.

Original owners

Owner Quantity Numbers Notes
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

Three sold to Metro-North, others split between CSX & NS

One sold to the Delmarva coast line railroad from conrail.
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
Texas Utilities 2 3306–3307


  1. Hans Halberstadt (13 September 1996). Modern Diesel Locomotives. MBI Publishing Company. pp. 62–. ISBN 978-0-7603-0199-9. Retrieved 14 April 2010.
  2. 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.
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