Cornishman Richard Trevithick's newly built Penydarren steam…
February
1804 CE
Cornishman Richard Trevithick's newly built Penydarren steam locomotive, following several trials since February 13, 1804, operates on the Merthyr Tramroad, between Penydarren in Merthyr Tydfil and Abercynon in South Wales, on February 21; it is the world's first locomotive to work on rails.