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Richard Trevithick is credited with steam engine research and development, leading to what has been variously described as "the first steam-powered passenger vehicle", or "his first high-pressure steam locomotive", in both cases referring to his unveiling and testing of the "Puffing Devil" (or simply, "Puffer") on 24 December 1801. This was a result of his refinements of the steam engine of James Watt toward "strong [high pressure]

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