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GE U25B Diesel-Electric Locomotive
The GE U25B was General Electric's first independent entry into the United States domestic Diesel-electric locomotive railroad market for heavy production road locomotives since 1936. From 1940 through 1953, GE participated in a design, production, and marketing consortium (Alco-GE) for diesel-electric locomotives with the American Locomotive Company. Starting in 1956 GE launched its Universal Series of diesel locomotives for the export market. The U25B was the first attempt at the domestic market since its termination of the consortium agreement with Alco.

History
The U25B (nicknamed U-Boat) was the first commercially successful domestic diesel electric road locomotive designed, built, and sold by General Electric after its split with the American Locomotive Company (Alco), a company dating back to the steam era. Along with Ingersoll-Rand, GE built the first viable American diesel-electric locomotive in 1928. GE had previously produced a number of prototype diesel switchers, in part with Alco. The GE Universal Series started production in 1956 and some 400 export locomotives were sold before the U25B was offered in the United States.

The U-Boat put GE on the road to becoming the top locomotive producer in the U.S., much to the chagrin of EMD. It introduced many innovations to the U.S. diesel locomotive market, including a pressurized car body and a centralized air processing system that provided filtered air to the engine and electrical cabinet, thus reducing maintenance. The U25B was also the highest-horsepower four-axle diesel road locomotive in the U.S. at the time of its introduction, its contemporaries being the GP20 (2,000 hp) and the RS27 (2,400 hp or 1,800 kW).

Though many were produced and sold, the only remaining U25B locomotives are in museums, as many were retired or scrapped at the end of their service life by the end of the 1980s.

Rebuilds
Four Southern Pacific U25Bs were rebuilt by Morrison-Knudsen with a Sulzer V-12 prime mover. These locomotives, designated M-K TE70-4S, operated from 1978–1987.

Preservation
Only one remains in operating condition. Southern Pacific 3100 is now on permanent exhibit at the Orange Empire Railway Museum in Perris, California. Built in 1963, this locomotive was first numbered SP 7508. Later numbered SP 6800, it became a goodwill ambassador for the railroad in 1976 when it was painted in an elaborate red, white, and blue color scheme in celebration of the nation's bicentennial; it was later renumbered and repainted in standard SP livery and was donated to the museum. The 3100 is fully certified to run on any of the nation's railroads and is frequently used as motive power for offsite work trains.

A second U25B locomotive is currently undergoing restoration efforts at the Illinois Railway Museum in Union, IL. Former Milwaukee Road engine number 5056 (built in 1965) is being both cosmetically and mechanically restored for operation on the museum grounds.

A third U25B locomotive is on display at the Western Pacific Railroad Museum in Portola, CA. Former Milwaukee Road engine number 5057 can be made operable. It was purchased by Cascade Rail Foundation to eventually be displayed at the South Cle Elum Rail Yard.

New York Central No. 2500 is on display at the Lake Shore Railway Historical Society museum in North East, Pennsylvania.

Conrail 2510 was to be preserved by The Great Northeastern Rail Road Foundation, but the plans fell through and the engine is sitting in rough shape, in Glenmont, NY. It is currently owned by the National Railway Historical Society. It was built as New York Central 2510 in May 1964.

New York, New Haven & Hartford No. 2525 has been preserved by the Railroad Museum of New England/Naugatuck Railroad of Thomaston, CT. It wears its original New Haven colors, however it is not currently operational.

Original owners

General Electric (XP-24 testbed)

Quantity:  2
Numbers:  751–752
Notes:  Never sold, retained by GE.

General Electric (demonstrator)

Quantity:  4
Numbers:  753–756
Notes:  High short hood; to Frisco 804–807.
Quantity:  4
Numbers:  2501–2504
Notes:  to Union Pacific 633–636.
Quantity:  5
Numbers:  51-55
Notes:  to Frisco 812, 815, 814, 813, and 811.

Atchison, Topeka and Santa Fe Railway

Quantity:  16
Numbers:  1600–1615
Notes:  renumbered 6600–6615.

Chesapeake and Ohio Railway

Quantity:  38
Numbers:  2500–2537
Notes:  renumbered 8100–8137.

Chicago, Burlington and Quincy Railroad

Quantity:  6
Numbers:  100–105
Notes:  to Burlington Northern 5424–5429.

Chicago, Milwaukee, St. Paul and Pacific Railroad ("Milwaukee Road")

Quantity:  12
Numbers:  380–391
Notes:  380 retired 1966; remainder renumbered 5000–5010; renumbered 5050–5060.

Chicago, Rock Island and Pacific Railroad

Quantity:  39
Numbers:  200–238
Notes:  225–238 to Maine Central Railroad 225–238.

Erie Lackawanna Railroad

Quantity:  27
Numbers:  2501–2527
Notes:  to Conrail 2570–2596.

Great Northern Railway

Quantity:  24
Numbers:  2500–2523
Notes:  to Burlington Northern 5400–5423.

Louisville and Nashville Railroad

Quantity:  27
Numbers:  1600–1626

New York Central Railroad

Quantity:  70
Numbers:  2500–2569
Notes:  to Penn Central 2500–2569; to Conrail 2500–2569.

New York, New Haven and Hartford Railroad

Quantity:  26
Numbers:  2500–2525
Notes:  to Penn Central 2660–2685; to Conrail 2660–2685.

Norfolk and Western Railway

Quantity:  1
Number:  3515
Notes:  renumbered 8138 (wreck replacement for Wabash unit).

Pennsylvania Railroad

Quantity:  59
Numbers:  2500–2548, 2649–2658
Notes:  renumbered 2600–2658; to Penn Central 2600–2658; to Conrail 2600–2658.

St. Louis – San Francisco Railway ("Frisco")

Quantity:  23
Numbers:  800–803, 808–810, 816-831 804–807, 811-815
Notes:  811-815 ex GE. Numbers 800–807 were high short hood units in black and yellow scheme; The next set (808–815) were low short hood units in black and yellow (see photo below). The last 16, 816-831, were low hoods and delivered in the orange and white scheme. To Burlington Northern 5210–5233.

Southern Pacific Company

Quantity:  68
Numbers:  7500–7567
Notes:  renumbered 6700–6767.

Union Pacific Railroad

Quantity:  12
Numbers:  625–632, 637–640, 633–636
Notes:  633–636 ex GE demonstrators 2501-2504. The only railroad, other than the Frisco, to have high short hood U25Bs.

Wabash Railroad

Quantity:  15
Numbers:  500–514
Notes:  to Norfolk and Western 3516–3529; renumbered 8139–8152.

Total Quantity:  478

GE U25B Overview
Type and origin
Power type: Diesel-electric
Builder: GE Transportation Systems
Model: U25B
Build date: April 1959 – February 1966
Total produced: 478
Specifications
Configuration:
​ • AAR B-B

Weight: 132 tons
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime mover: GE FDL-16
Transmission: Diesel electric
Performance figures
Power output: 2,500 hp (1,900 kW)
Career
Disposition: most scrapped, a few in preservation

See also:

GE Diesel Locomotives

Diesel Locomotives

A U25B Slideshow.

SP No. 3100 is the only GE U25B still in working order.

Classic Streamliners - TRAIN​CYCLOPEDIA

Milwaukee Road GE U25B No. 5005 at Bellingham, Washington 1972.

SP No. 3100 is the only GE U25B still in working order.

By Original uploader was Pretzelpaws at en.wikipedia - Transferred from en.wikipedia, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4113145Type your paragraph here.

Frisco U25B No. 808 Builder's Photo, Erie, PA, June 26, 1963.

GE logo
SLSF U25B No. 808 Builder's photo.
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Milwaukee Road GE U25B No. 5005 at Bellingham, Washington 1972.

CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=49790