Q2 engine 4-4-6-4 class engine

Q2 engine 4-4-6-4 class engine

The Pennsylvania Railroad's class Q2 comprised one prototype and twenty-five production duplex steam locomotives of 4-4-6-4 wheel arrangement.

They were the largest non-articulated locomotives ever built and the most powerful locomotives ever static tested, producing 7,987 cylinder horsepower (5,956 kW) on the PRR's static test plant. They were by far the most successful duplex type. The duplex propensity to slip was combated by an automatic slip control mechanism that reduced power to the slipping unit.

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). 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.

Despite the overall success, the Q2s were all out of service by 1951. With dieselization, they were the obvious first targets to be withdrawn since they were only a little more capable than the conventional J1 class 2-10-4s but with far higher operating and maintenance costs. The final Q2, 6199's power output is 7,987 hp. All have been scrapped and none were preserved.

Author: Mstnoodle

Q2 engine 4-4-6-4 class engine
• config.txt 4.19KB
q2_engine_body
a5red.bmp 48.05KB
a5red.texture.txt 28 bytes
j1black.bmp 48.05KB
j1black.texture.txt 30 bytes
j1cablines-j1cablines_a.texture.txt 57 bytes
j1cablines.bmp 48.05KB
j1cablines_a.bmp 48.05KB
j1grayblack.bmp 48.05KB
j1grayblack.texture.txt 34 bytes
j1paint-j1paint_a.texture.txt 51 bytes
j1paint.bmp 768.05KB
j1paint.texture.txt 30 bytes
j1paint_a.bmp 768.05KB
matthew brass.bmp 48.05KB
matthew brass.texture.txt 36 bytes
matthew darkgrey.bmp 48.05KB
matthew darkgrey.texture.txt 39 bytes
matthewblack.bmp 48.05KB
matthewblack.texture.txt 35 bytes
matthewfirebox.bmp 48.05KB
matthewfirebox.texture.txt 37 bytes
q2_engine_body.im 617.73KB
q2_engine_shadow
black.bmp 48.05KB
black.texture.txt 26 bytes
q2_engine_shadow.im 615.27KB
• thumbnail.jpg 30.64KB