HO P3 E6 A/B Diesels UP/CNW #SF-4SF-5 City of San Francisco

EMD built the E-Units
between 1937 through 1963. Originally the name E unit referred to the
fact that these units boasted of eighteen hundred horsepower. This
designation remained throughout the E unit production even though later
models incorporated higher horsepower ratings. Due to the technology of
the time, E units like many locomotives used multiple units to achieve
the required power. EMD offered cabled units called B or booster units.
Some railroads ordered AB, ABB or ABA units depending on power
needs.E6s were manufactured by EMD in La Grange, Illinois, between the
years 1939 and 1941. To achieve 2,000 horsepower, EMD combined two
1,000 horsepower, 12 cylinder, model 567 engines inside of the engine
compartment.