What caused the Tom Thumb to lose its race against the horse?
Answer
Drive system mechanical failure
The race ended in defeat for the locomotive due to a failure in the belt-and-pulley drive system. Whether caused by a displaced pulley, a slipping belt, or a broken component like a piston rod fragment, the mechanical breakdown stopped the engine's power transfer to the wheels. This incident underscored the immediate challenges of early material stress and reliability that engineers had to address in subsequent locomotive designs.

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