 The withdrawal of passenger services on the Red Wharf Bay branch in September 1930 affected the Amlwch line, as the motor train that operated the extra Gaerwen–Llangefni services was withdrawn.Amlwch's engine shed was closed on 14 September 1931, with all trains being worked from Bangor.As the economy recovered, the number of Gaerwen–Amlwch services was increased.