Nationalisation of the railways in 1948 made the state the major shareholder in the SMT group of companies, and the group was itself fully nationalised in 1949. At that time, some of the group's smaller subsidiaries were wound up, including Lanarkshire Traction, which was fully absorbed by Central SMT. By this time, Central was firmly established as the dominant bus operator in Lanarkshire and western Dunbartonshire. This dominant position was furthered by the takeover of John Laurie and Company of Hamilton in 1961. During this period, Central was consistently the most profitable company in the Scottish Bus Group. From the late 1970s, the trading name of the company became 'Central Scottish'.