The Chester and Holyhead Railway was an early railway company conceived to improve transmission of Government dispatches between London and Ireland, as well as ordinary railway objectives. Its construction was hugely expensive, chiefly due to the cost of building the Britannia Tubular Bridge over the Menai Strait. The company had relied on Government support in facilitating the ferry service, and this proved to be uncertain. The company opened its main line throughout in 1850. It relied on the co-operation of other railways to reach London and in 1859 it was absorbed by the London and North Western Railway.