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[url]http://hermann-weigl.de/steam/rekorde.htm[/url] The world´s strongest steam engines produced in series were the Big Boys of the Union Pacific Railroad. These mallets with the wheel arrangement 2 D D 2 had a lenght of 40.5 m, weighed 545 tons, provided 6000kW, and had a tractive effort of 609 kN. This was sufficient to tow loads of 4000 tons across the climbing slope of the Sherman pass that had a climb of 4.6 %. A Big Boy was even able to keep going a freight train of 650 freight cars that had a weight of 27000 tons and a length of nearly 10 km (32800 feet), after it had been pushed into motion. Big Boys were not only big and heavy, they also reached a maximum speed of 130 km/h (80 mph) which was extremely extraordinary for a Mallet of this size. On the plain they led freight trains up to 6000 t, but they also pulled 3200-ton-trains across the 8%-slope between Carter and Green River at an average speed of 78 km/h (48 mph). I don't know who their sources are and note the 10km train was "after it had been pushed into motion".
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