What was the main reason for modifying original British locomotive designs?
Answer
They were often too light for the uneven and rugged American track conditions
The early locomotives imported from Great Britain were designed for smooth, gentle track environments. When these machines were brought to America, they proved ill-suited for the rugged, less standardized, and often rougher terrain encountered in the United States. To address this, American engineers had to heavily modify the designs, often increasing the weight and robustness of the frames, improving boiler construction, and adjusting the wheel configurations to handle the increased stress of navigating uneven tracks while hauling heavier loads.

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