The Pennsylvania Railroad's class Q2 comprised one prototype and twenty-five production duplexsteam locomotives of 4-4-6-4 wheel arrangement. 1893 map The Pennsylvania Railroad (AAR reporting mark PRR) was an American railroad existing 1846–1968, after which it merged into Penn Central Transportation. ... A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders. ... Great Western Railway No. ... In Whyte notation, a 4-4-6-4 is a railroad steam locomotive that has four leading wheels followed by four coupled driving wheels, a second set of six driving wheels and four trailing wheels. ... Locomotive wheel arrangement is how the wheels of the locomotive are arranged by type, position, and connections. ...
References
Staufer, Alvin (1962). Pennsy Power, p. 216–225, Staufer. LOC 62-20872.
Brian Reed (June 1972). Loco Profile 24: Pennsylvania Duplexii, Profile Publications.
Harley, E.T. (1982). Classic Power 5: Pennsy Q Class, Hicksville, New York: N.J. International. ISBN 0-934088-09-8.
The 4-4-4-4s were all PRR T1s except one; the Baltimore and Ohio had one class N-1 4-4-4-4 whose rear cylinders were located beneath the firebox and drove the rear two pairs of driving wheels.
The Q2 (and the T1 as well) were higher speed locomotives and if they couldn't operate at that speed range, they tended to use more coal and water per unit of out put than conventional, similar sized locomotives.
PRR changed direction and committed to diesels about the time the final T1 was placed in service.
The 4-4-2 "Atlantic" type was assigned class E. The PRR was an enthusiastic user of the Atlantic type in flatter country, and built some of the most advanced Atlantics used in the United States.
The 2-6-0 "Mogul" type was assigned class F. On the PRR, this type was used during the period of 1895–1925, approximately.
The PRR never built any steam locomotives of the 4-8-4 "Northern" type, although the T1 duplexes were effectively a "Northern" with the driving wheels split into two groups.
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