The 4-6-0 type steamer - often called a Ten-Wheeler - met Canadian Pacific's need for a smaller locomotive that could handle both passenger and freight traffic over light duty track. The most numerous of the several classes was the D10. Between 1907 and 1913 the CPR acquired more than 500 of them from major Canadian builders as well as its own Angus Shops in Montreal. They had 63-inch (1600 mm) driving wheels and 21 x 28-inch (533 x 711 mm) cylinders, operated at 200 psi (13.8 bar) boiler pressure and produced about 30,000 pounds of tractive force (133 kN). Some were active to the end of steam operations, and six of the D10 class remain today including No. 972, stored inoperative at the Strasburg Railroad Museum in Pennsylvania.
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