Railway Mania: Boom, Bust and a National Network

In the mid-1840s Britain experienced 'railway mania', a speculative investment boom. Middle-class investors rushed to buy shares in new railway companies, and in 1846 alone Parliament passed 272 acts authorizing new lines. Promoters such as George Hudson, the 'Railway King', built empires by merging lines, but some schemes were badly planned, and when the bubble burst in 1847 many investors lost heavily; Hudson himself was later disgraced for financial irregularities.

Yet the mania left a lasting legacy: thousands of miles of track that became a national network. Britain had more than 6,000 miles of railway by 1850. Railways created huge demand for iron, coal and engineering, employed armies of construction workers called navvies, and created new towns such as Crewe and Swindon. The episode shows how speculative bubbles can waste money while still building useful infrastructure.