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]

This article relies largely or entirely on a single source. (October 2016)

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Pennsylvania Railroad no. 1320
Type and origin Power type Steam Designer Francis Webb Builder Beyer, Peacock & Company Build date 1889 Total produced 1
Specifications Configuration: ​  • Whyte 2-2-2-0  • UIC 1AA n3v Gauge 4 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)  • Leading 8 ft 5 in (2.57 m)  • Drivers 9 ft 8 in (2.95 m) Loco weight 43 long tons (44 t) Boiler: ​  • Diameter 4 ft 2 in (1.27 m)  • Tube plates 11 ft 0 in (3.35 m) Boiler pressure 175 lbf/in2 (1.21 MPa) Heating surface 1,401.5 sq ft (130.20 m2) Cylinders Three: two HP (outside), one LP (inside) High-pressure cylinder 14 in × 24 in (356 mm × 610 mm) Low-pressure cylinder 30 in × 24 in (762 mm × 610 mm) Valve gear Joy
Career Operators Pennsylvania Railroad Numbers 1320 Official name Pennsylvania Delivered 1889 Scrapped 1897 Disposition Scrapped

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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.