Pennsylvania Railroad Q2

The Pennsylvania Railroad class Q2 was a duplex steam freight locomotive of the 4-4-6-4 wheel arrangement, one prototype and twenty-five production engines built in 1944 and 1945. On the railroad's static test plant it produced 7,987 cylinder horsepower, the most of any locomotive tested there, and it was the largest non-articulated locomotive ever built. The company claimed a Q2 could pull 125 freight cars at 50 miles per hour. In practice the engines slipped, used more coal and water than the older J1 class, and spent long periods out of service, so all were out of service by 1951.