George and Robert Stephenson built 'Stephenson's Rocket,' the first truly successful multi-tubular boiler steam locomotive. It won the Rainhill Trials, proving that steam power was fast and reliable enough for passenger travel. This invention triggered the 'Railway Mania' of the 19th century, connecting distant cities, standardizing time zones, and allowing for the rapid transport of coal and industrial goods. It was the primary engine of the Industrial Revolution, enabling the first mass-movement of people and ideas across land at speeds faster than a horse.