A running steam locomotive was used for the first time on this day in British history, 21 February 1804. The locomotive’s inventor was Richard Trevithick, a mining engineer from Cornwall. After seeing several of Trevithick’s early models, Trevithick’s boss was impressed and bet a rival that the locomotive could haul 10 tons of iron a distance of 10 miles. On 21 February 1804, successfully carried 10 tons of iron, 5 wagons and 70 men the full distance in 4 hours and 5 minutes, an average speed of approximately 2.4 mph (3.9 km/h). The color image above shows a full-scale working replica of the “Pen-y-Darren” locomotive at the Swansea Maritime Museum.