Baltimore and Ohio Class N-1
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 Baltimore and Ohio Railroad #5600 George H. Emerson |
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| Power type | Steam |
|---|---|
| Builder | Mt. Clare Shops |
| Build date | 1931 |
| Configuration | 4-4-4-4 |
| Gauge | 4 ft 8½ in (1435 mm) |
| Driver size | 76 in (1.93 m) |
| Length | !117 ft 0¼ in (35.67 m) |
| Weight on drivers | 238,000 lb (108,000 kg) |
| Locomotive and tender combined weight | 736,500 lb (334,000 kg) |
| Fuel type | coal |
| Tender capacity | 46,000 lb (21,000 kg) coal, 22,000 US gallons (83,000 L) water |
| Boiler pressure | 350 lbf/in² (2.41 MPa) |
| Heating surface: Total | 4,857 ft² (451 m² |
| Superheater area | 1,312 ft² (122 m²) |
| Cylinders | 4 (duplex) |
| Cylinder size | 18 in × 26½ in (457 mm × 673 mm) |
| Career | Baltimore and Ohio Railroad |
| Class | N-1 |
| Number in class | 1 |
| Number | 5600 |
| Official name | George H. Emerson |
The Baltimore and Ohio Railroad's sole Class N-1 steam locomotive, #5600 George H. Emerson, was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was designed and built by the railroad's own shops in 1937. The rear set of cylinders were placed beside the firebox. This allowed the locomotive's wheelbase to remain the same. The space beside the firebox was hot and dirty, which caused premature cylinder wear, and the placement of the cylinders limited the size of the firebox. These same problems occurred on the PRR Q1, which also placed the rear cylinders by the firebox.
 B & O 5600 at the 1939 New York World's Fair |
 Detail, showing the rearward cylinders and gear |
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