Pennsylvania No. 1320

Pennsylvania 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.
==Design==
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". 
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.
==External links==
*Picture of this locomotive (ETH Zurich)
Category:Beyer locomotives
Category:Built in 1889
Category:Scrapped locomotives
Category:Steam locomotives
Category:Locomotives
Category:Standard gauge steam locomotives of Great Britain
Category:Standard gauge locomotives
Category:2-2-2-0 locomotives
Category:2-2-2-0 steam locomotives
Category:Three-cylindered locomotives
Category:Compound locomotives
Category:Passenger locomotives
Category:Experimental locomotives
Category:Pennsylvania locomotives
Category:Standard gauge locomotives of the United States
Category:4 foot 8 1⁄2 inch gauge