High Quality Content by WIKIPEDIA articles! The Railway Mania was the speculative frenzy in Britain in the 1840s. It followed a common pattern: as the price of railway shares increased, more and more money was poured in by speculators, until the inevitable collapse. It reached its zenith in 1846, when no fewer than 272 Acts of Parliament were passed, setting up new railway companies, and the proposed routes totalled 9,500 miles (15,300 km) of new railway. Around a third of the railways authorised were never built ? the company either collapsed due to poor financial planning, was bought out by a larger competitor before it could build its line, or turned out to be a fraudulent enterprise to channel investors' money into another business.