By the mid-19th century, Caldicot was a small farming village. However, the opening of the South Wales Railway brought London and Cardiff within relatively easy reach (although Caldicot station itself was not opened until 1936). The railway attracted industry, and 1862 Henry Hughes of Tintern opened a wireworks next to the railway, becoming the village's major employer and attracting many new workers. In 1880 it became a tinplate works for the canning industry. In 1879 work began on the Severn Tunnel, which was opened in 1886. Its construction brought hundreds of workers to Caldicot, roughly doubling its population.