Southern Pacific 3100

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Southern Pacific 3100
Power type Diesel
Builder GE Transportation Systems
Model U25B
Build date 1963
AAR wheel arr. B-B
Gauge ft 8½ in (1435 mm)
Career Southern Pacific Railroad
Current owner Orange Empire Railway Museum
Disposition operates in excursion service

Southern Pacific Railroad number 3100 is a GE U25B diesel locomotive. It is on permanent exhibit at the Orange Empire Railway Museum in Perris, California. It was built in 1963 by General Electric.

The 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, repainted in standard SP livery and was donated to the museum as such. 3100 is fully certified to run on any of the nation's railroads and is frequently used as motive power for off-site work trains.