In 1916, the Canadian Government Railway received the first ten 2-10-2 locomotives from ALCO-Brooks which soon became Canadian National class T-1-a. Ten more followed in 1918 from Montreal Locomotive Works, these became T-1-b. These locomotives looked relatively short and had their firebox mounted above the last driving axle. This resulted in a low axle load of only 31,000 pounds on the trailing axle, while the leading one carried 33,000 pounds. The five driving axles carried 256,000 pounds, what was an average of more than 51,000 per axle. The drivers had a diameter of 57 inches and the cylinders measured 26 inches in diameter and 32 inches in stroke. In 1920, MLW built 25 more which had a slightly smaller boiler and were lighter. These were put into service as class T-1-c. Some years later, all sub classes received thermic syphons while they lost 19 small tubes. In the thirties, they were rebuilt with completely new boilers. These had a smaller tube heating surface, but the grate area had been increased from 66.7 to 77.3 square feet. The coal capacity of the tenders was increased from 16 to 18 tons with hoppers. The last ones were retired in 1962.