 It then turns north-east around Parys Mountain before reaching Amlwch.The railways arrived on Anglesey with the construction of the Chester and Holyhead Railway, of which the section from Llanfairpwll to Holyhead opened in 1848, two years before the Britannia Bridge was finished.The Chester and Holyhead railway surveyed a branch to Llangefni in 1852, but chose not to proceed.