Formed when the Caledonian and G & SW were merged in 1923 into the London, Midland and Scottish Railway (LMS) and their fleets amalgamated into the Caledonian Steam Packet Co. At the end of December 1968 management of the CSP passed to the Scottish Transport Group, which gained control of MacBrayne's the following June. On 1 January 1973 the Caledonian Steam Packet Co. acquired most of the ships and routes of MacBrayne's and the company name was changed to Caledonian MacBrayne.