The South Staffordshire Railway reached Brownhills in 1850 and led to a huge expansion of the local mining operation and with it a population explosion in the area, with the population increasing from 305 in 1801 to over 13,000 in 1891. In 1858 a branch line was constructed through the heart of what was then the hamlet of Brownhills, which led to a migration of the population eastwards, leading to the formation of mining slums in the Ogley Hay area. Eventually a new town centre developed, complete with library and theatre. This led to the gradual amalgamation of Brownhills, Ogley Hay and Catshill into one town.