Pennsylvania Railroad no. 1320

The Pennsylvania Railroad no. 1320 was a single experimental passenger three-cylinder compound 2-2-2-0 locomotive purchased by the Pennsylvania Railroad in 1889, based on the London & North Western Railway's Dreadnought class, designed by Francis Webb. As the London & North Western's Crewe Works, which had built the Dreadnought classes, was not legally allowed to sell its locomotives, 1320 was instead constructed by Beyer, Peacock & Company in Manchester to the Dreadnought's specifications.[1]

Pennsylvania Railroad no. 1320
Type and origin
Power typeSteam
DesignerFrancis Webb
BuilderBeyer, Peacock & Company
Build date1889
Total produced1
Specifications
Configuration:
​
 • Whyte2-2-2-0
 • UIC1AA n3v
Gauge4 ft 8+1⁄2 in (1,435 mm)
Leading dia.3 ft 6 in (1.067 m) + tyres
Driver dia.6 ft 0 in (1.829 m) + tyres
Wheelbase:
 • Engine		18 ft 1 in (5.51 m)
 • Leading8 ft 5 in (2.57 m)
 • Drivers9 ft 8 in (2.95 m)
Loco weight43 long tons (44 t)
Boiler:
​
 • Diameter4 ft 2 in (1.27 m)
 • Tube plates11 ft 0 in (3.35 m)
Boiler pressure175 lbf/in2 (1.21 MPa)
Heating surface1,401.5 sq ft (130.20 m2)
CylindersThree: two HP (outside), one LP (inside)
High-pressure cylinder14 in × 24 in (356 mm × 610 mm)
Low-pressure cylinder30 in × 24 in (762 mm × 610 mm)
Valve gearJoy
Career
OperatorsPennsylvania Railroad
Numbers1320
Official namePennsylvania
Delivered1889
Scrapped1897
DispositionScrapped

Design
Main article: LNWR Dreadnought Class

The design featured a boiler pressed to 175 lbf/in2 (1.21 MPa) delivering saturated steam to two outside 14-inch (356 mm) high-pressure cylinders, which exhausted to one 30-inch (762 mm) low-pressure cylinder inside the frames. All three cylinders had a stroke of 24 inches (610 mm); the high-pressure cylinders drove the rear wheels, while the low-pressure drove the leading driving wheels. As the two pairs of driving wheels were not connected, the locomotives were "duplex drive" or "double-singles".[2]

The locomotive performed poorly for the Pennsylvania, being slow and weak compared to the road's other, domestically purchased locomotives, as well as unsuited to the rougher trackage common of U.S. railroads. The unique design of the cylinders made the locomotive difficult to operate and maintain, making it unpopular among the road's engineers and management staff. The locomotive was scrapped in 1897.

Notes
  1. Oswald Nock, et al. Railways at the Turn of the Century, 1895-1905. Blandford P., 1969.
  2. Baxter 1979, pp. 194–195.

References
  • Baxter, Bertram (1979). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 2B: London and North Western Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. ISBN 0-903485-84-2.



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