 The ceremonial first sod was cut on 11 September 1863, with construction starting the following year by the contractors Dickson and Russell.With the line approaching Llangefni later in October 1864, LNWR engineers were authorised to build the main line junction at Gaerwen, at the Anglesey Central Railway's expense.The line opened for freight as far as Llangefni on 16 December 1864.