Railway Mania was the 1840s British speculative boom that collapsed after investors rushed into railway shares.
Britain’s railway network expanded rapidly during the 1840s. Parliament approved hundreds of proposed lines, and investors poured money into railway companies that promised to connect cities, ports, and industrial districts. Public enthusiasm was encouraged by the success of early routes such as the Liverpool and Manchester Railway.
The boom became unsustainable as share prices and projected plans outran realistic construction prospects. The Bank of England raised interest rates in 1845, making borrowing more expensive and reducing the flow of speculative money. Many proposed railways were abandoned, delayed, or consolidated, while investors suffered heavy losses.
Railway Mania was not a single trading-day crash like Black Monday. It was a speculative episode whose collapse affected British finance and transportation investment over several years. Some railways built during the boom became important long-term infrastructure, so the period produced both genuine economic development and substantial financial overoptimism.