Note 58 — Chapter IX · STEAM COMMERCE OF THE GREAT LAKES.

The weight that can be hauled by a locomotive depends largely on the gradients of the road traversed. Winnipeg and Fort William are nearly on the same sea level, but between them the line of railway ascends and descends some 800 feet, limiting the drawing power of a sixty-ton locomotive in certain sections to, say, 900 tons. On a level road a large American locomotive will easily draw sixty cars containing 1,000 bushels of wheat each, or a total weight of 3,000 tons. As with steamships, the tendency is to increase the size of the locomotive. There is this difference, however: the weight and power of the locomotive are limited by the strength of the rail upon which it travels.