| EMC EA/EB |
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B&O EA 51 on the Capitol Limited sitting next to the Tom Thumb locomotive replica, in 1937. |
| Type and origin |
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| Power type | Diesel-electric |
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| Builder | Electro-Motive Corporation (EMC) |
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| Serial number | 666 (51) 667 (51X) 668 (52) 669 (52X) 765-766 (53 & 54) 767 (55) 768-769 (53X & 54X) 770 (55X) 800 (56) 801 (56X) |
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| Build date | May 16th, 1937–June 1938 |
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| Total produced | 6 A units, 6 B units |
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| Performance figures |
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| Maximum speed | 68–99.4 mph (109.4–160.0 km/h) |
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| Power output | 1,800 hp (1,300 kW) |
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| Tractive effort | 251.3 kN (56,500 lbf) |
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The EMC EA/EB is an early passenger train-hauling diesel locomotive built from May 16, 1937, to 1938 by Electro-Motive Corporation of La Grange, Illinois for the Baltimore and Ohio Railroad. They were the first model in a long line of passenger diesels of similar design known as EMD E-units. Each locomotive unit developed 1,800 horsepower (1,300 kW) from two 900 hp (670 kW) Winton 201-A diesel engines, driving the wheels through an electric transmission—the generator driven by each engine provided current for traction motors. The locomotives were of A1A-A1A wheel arrangement—two three-axle trucks of which only the outer two axles were powered. Six two-unit 3,600 hp (2,700 kW) 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'.