After years of fierce competition between all the fleets, the Caledonian and G&SW were merged in 1923 into the London, Midland and Scottish Railway (LMS) and their fleets were amalgamated into the Caledonian Steam Packet Company. Their funnels were painted yellow with a black top. At the same time the North British Railway fleet became part of the London and North Eastern Railway (which built the in 1947). With nationalisation in 1948 the LMS and LNER fleets were amalgamated under British Railways with the name "Clyde Shipping Services". In 1957 a reorganisation restored the CSP name, and in 1965 a red lion was added to each side of the black-topped yellow funnels. The headquarters remained at Gourock pierhead.