 This was a period of concern for the Supporters' Association but the future of the line to Port Erin was assured and trains ran on this southern line in 1969 and onwards, celebrating the centenaries in 1973 and 1974 with special trains.But in 1975 and 1976 the services were curtailed between Port Erin and Castletown, then Port Erin and Ballasalla and the group became politically active in fighting for the retention of the full southern line.Following major campaigns that included the Supporters' Association heavily, trains returned to Douglas in 1977 and following nationalisation the following year the group took on more of a watchdog role, ultimately moving on to restore another railway in Groudle Glen whilst maintaining strong connections with the railway into the twenty first century.