Baltimore and Ohio class N-1

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Power type Steam

Builder B&O Mount Clare Shops

Build date May 1937

Total produced 1

Configuration:

Whyte 4-4-4-4

UIC 2′BB2′

Gauge 4 ft 8+1⁄2 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+1⁄4 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

Power output 3,936 hp (2,935 kW) at cylinders

Tractive effort 65,000 lbf (289.1 kN)

Factor of adh. 3.66

Operators Baltimore and Ohio Railroad

Class N-1

Numbers 5600

Official name George H. Emerson

Retired 1943

Scrapped October 1950

Additional information

Baltimore and Ohio class N-1

Class of 1 American 4-4-4-4 locomotive

The Baltimore and Ohio class N-1 steam locomotive, #5600 (named "George H. Emerson"), was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was unique in the fact that it had a water tube firebox, which was much larger than a normal firebox. It was designed and built by the railroad's own shops in 1937.

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History

Construction and design

B&O #5600 was designed and built by the Baltimore and Ohio Railroad's own Mount Clare Shops in May 1937.¹ ²

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. It was built by the B&O's own Mount Clare Shops in 1937; however, it had problems with the sizes of the cylinders facing the other direction.

Retirement

In 1943, No. 5600 was retired from service. The locomotive was then cut up for scrap in 1950.³

Gallery

Bibliography

Reed, Brian (June 1972). Pennsylvania Duplexii. Loco Profile 24. Windsor, Berkshire: Profile Publications Limited. pp. 266–267.
Morrison, Tom (2018-07-24). The American Steam Locomotive in the Twentieth Century. McFarland. pp. 403–405. ISBN 978-1-4766-2793-9.

References

Locomotive Cyclopedia of American Practice. Simmons-Boardman Publishing Corporation. 1938. pp. 205–206. https://www.google.com.au/books/edition/Locomotive_Cyclopedia_of_American_Practi/5CVSAQAAIAAJ?hl=en&gbpv=1&dq=Baltimore+and+Ohio+class+N-1&pg=PA205&printsec=frontcover ↩
Morrison (2018), p. 403 - Morrison, Tom (2018-07-24). The American Steam Locomotive in the Twentieth Century. McFarland. pp. 403–405. ISBN 978-1-4766-2793-9. https://www.google.com.au/books/edition/The_American_Steam_Locomotive_in_the_Twe/Ka9mDwAAQBAJ?hl=en&gbpv=1&dq=Baltimore+and+Ohio+class+N-1&pg=PA445&printsec=frontcover ↩
Morrison (2018), p. 405 - Morrison, Tom (2018-07-24). The American Steam Locomotive in the Twentieth Century. McFarland. pp. 403–405. ISBN 978-1-4766-2793-9. https://www.google.com.au/books/edition/The_American_Steam_Locomotive_in_the_Twe/Ka9mDwAAQBAJ?hl=en&gbpv=1&dq=Baltimore+and+Ohio+class+N-1&pg=PA445&printsec=frontcover ↩