The engine shed - a sub-shed of Croes Newydd - closed as long ago as 1906, but it was clearly in use for some purpose in 1936. The building was demolished between 1936 and 1959 except for the walls towards the rear which supported the water tank which served the water crane, with the buffer stops being moved forwards outside the site of the shed. Walls, tank, crane and turntable remained in use to the last train on 27 January 1961. It was custom and practice for all locomotives which arrived at Blaenau to be sent to Tan-y-Manod to be watered, serviced and turned. They then returned to Blaenau for their next train southwards, sometimes shunting coal wagons at Blaenau gas works on the way.