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The Q2 locomotive was 78% more powerful than the locomotives that PRR had in service at the time, and the company claimed the Q2 could pull 125 freight cars at a speed of 50 mph (80 km/h). [5] These were an improved version of the previous Q1 class, which was a 4-6-4-4 dual-purpose engine instead of a 4-4-6-4 freight engine.
The Pennsylvania Railroad's Q2 class were the only locomotives ever to use this arrangement. These were duplex locomotives , in which both sets of driving wheels were mounted in a common, rigid locomotive frame .
PRR Q2: Pennsylvania Railroad: 6131, 6175-6199 Altoona Works: 1941–45 Steam 4-4-6-4: 456 tonnes (503 short tons) 115,816 pounds-force (515 kN) with booster 7,987 horsepower (5,956 kW) Most powerful steam locomotive ever static tested. PRR S1: Pennsylvania Railroad: 6100 Altoona Works: 1939 Steam 6-4-4-6: 487 tonnes (537 short tons) 76,403 ...
PRR FF1 experimental locomotive PRR GG1 #4890 at the National Railroad Museum in Green Bay, Wisconsin. When work on the Hudson River tunnels and New York's Penn Station was in progress, the type of electric locomotives to be used was an important consideration. At that time only a few electric locomotives existed.
The PRR Q1 6130 - the only locamotive with this wheel arrangement In Whyte notation , a 4-6-4-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels , a second set of four driving wheels and four trailing wheels .
See also PRR locomotive classification. Pages in category "Pennsylvania Railroad locomotives" ... Pennsylvania Railroad Q2 class; R. Pennsylvania Railroad class R1; S.
The Q2 4-4-6-4 was the most successful example of the duplex locomotive constructed by the PRR. Production locomotives followed from the end of 1944, but these were rather different, the lesson that backward-facing cylinders next to the firebox were a poor design choice made clear.
These were both withdrawn from service by the mid-1920s. In 1942, the PRR built 123 2-10-4 "Texas" type locomotives based on C&O plans; class J now being unoccupied, it was reused for them. The PRR J1 was an improved version of its C&O counterpart with more pulling power. J1 - 2-10-4 freight locomotives. J28 - experimental 2-6-2 locomotives.