Falling production and a decrease in orders meant that the State Mines Department closed the Roa Incline on 25 July 1960. From July 1963, only one train was permitted to operate on the Blackball Branch at a time, though due to the low quantity of traffic it is doubtful this policy ever had to be seriously enforced. By 1964, the line served just one active mine, operating on a limited basis. The Railways Department began to consider closure of the line, and when a flood on 21 February 1966 destroyed two spans of the Grey River bridge it was decided that repairs would not be economic and the line was closed.