What primary limiting factor for tractive effort affected early locomotives?
Answer
Adhesion between iron wheels and iron rails
Tractive effort refers to the force required to start a train and move it up gradients. In early locomotives, this force was limited by the amount of friction or adhesion that could be achieved between the metal driving wheels and the iron rails. If too much steam power was applied at once, the driving wheels would simply spin on the rails rather than moving the train forward, especially when starting a heavy load. This physical limitation meant that the total weight and wheel arrangement of the engine were critical factors in how much freight or how many passengers it could actually pull.

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