On February 21, 1804, what specific load did the first steam locomotive successfully haul?
Answer
Ten tons of iron and seventy men
The historic 1804 trial at the Penydarren Ironworks involved the locomotive successfully pulling ten tons of iron along with seventy people. This demonstration spanned a distance of nine and a quarter miles of track. This event was highly significant because it provided the first recorded instance of a steam locomotive moving on rails under its own power, moving a meaningful industrial load that proved the concept of steam-powered rail transport.

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Trevithick - The World's First Locomotive - YouTube
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