Baltimore and Ohio class N-1

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B&O #5600 George H. Emerson
Baltimore and Ohio Duplex.jpg
Baltimore and Ohio Railroad #5600 George H. Emerson
Type and origin
Power type Steam
Builder B&O Mount Clare Shops
Build date May 1937
Total produced 1
Specifications
Configuration:
 • Whyte 4-4-4-4
 • UIC 2′BB2′
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Leading dia. 36 in (914 mm)
Driver dia. 76 in (1,930 mm)
Trailing dia. 42 in (1,067 mm)
Minimum curve 13° or 441.68 ft (134.62 m) normal,
18° or 319.62 ft (97.42 m) slow
Length 117 ft 0 14 in (35.67 m)
Adhesive weight 238,000 lb (108,000 kilograms; 108 metric tons)
Loco weight 386,500 lb (175,300 kilograms; 175.3 metric tons)
Tender weight 350,000 lb (160,000 kilograms; 160 metric tons)
Total weight 736,500 lb (334,100 kilograms; 334.1 metric tons)
Tender type Vanderbilt with two 3-axle trucks
Fuel type Coal
Fuel capacity 46,000 lb (21,000 kilograms; 21 metric tons)
Water cap 22,000 US gal (83,000 l; 18,000 imp gal)
Firebox:
 • Firegrate area
80.5 sq ft (7.48 m2)
Boiler pressure 350 lbf/in2 (2.41 MPa)
Heating surface 4,897 sq ft (454.9 m2)
 • Tubes and flues 4,220 sq ft (392 m2)
 • Firebox 677 sq ft (62.9 m2)
Superheater:
 • Type B&O
 • Heating area 1,312 sq ft (121.9 m2)
Cylinders Four, duplex
Cylinder size 18 in × 26.5 in (457 mm × 673 mm)
Valve gear Walschaerts
Performance figures
Power output 3,936 hp (2,935 kW) at cylinders
Tractive effort 65,000 lbf (289.1 kN)
Factor of adh. 3.66
Career
Operators Baltimore and Ohio Railroad
Class N-1
Numbers 5600
Official name George H. Emerson
Retired 1943
Scrapped October 1950

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.

References[edit]

  • Reed, Brian (June 1972). Pennsylvania Duplexii. Loco Profile 24. Windsor, Berkshire: Profile Publications Limited. pp. 266–267.