The Electro-Motive Corporation (later EMD) EA/EB was an early passenger train-hauling diesel locomotive built in 1937-1938 for the Baltimore and Ohio Railroad. Along with the near simultaneous E1 for the Santa Fe and E2 for the Union Pacific, they were the first model in a long line of passenger diesels of similar design known as EMD E-units.
Each unit developed 1,800 horsepower (1,300 kW) from two 900 hp Winton 201-A diesel engines, powering generators for the axle mounted election traction motors: two on each bogie (truck) with a running axle in between, thus A1A-A1A types.
Six two-unit 3600 hp locomotives were produced, each consisting of a lead cab-equipped EA A unit and a cabless booster EB B unit. They were numbered 51 through 56; the A units bore the bare number and the B units the number followed by 'X'.
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