Caledonian Steam Packet Company

Rival railway companies, the Caledonian Railway (CR), the North British Railway (NBR) and the Glasgow and South Western Railway (GSWR) at first used the services of various early private operators of Clyde steamers. The CR failed to attract private ship owners to their new extension from Greenock to the fishing village of Gourock. They had purchased the harbour at Gourock, which had advantages of a faster line from Glasgow, bypassing the Glasgow and South Western Railway Prince's Pier at Greenock, and being closer to the Clyde resorts. The CR began operating steamers on its own account in 1889.

The Caledonian Steam Packet Company (CSP) was formed as a packet company in May 1889, with Captain James Williamson as secretary and manager. Nominally an independent company, they bought the ships needed to operate steamer services to and from Gourock. On withdrawal of the Wemyss Bay Steamboat Company in 1890, CSP took over services to Rothesay, Largs and Millport. In June 1890, they established a service to Arran from the Lanarkshire and Ayrshire Railway railhead at Ardrossan. In the years that followed, there was significant investment in piers and ships.

On 1 January 1973 the Caledonian Steam Packet Co. acquired most of the ships and routes of David MacBrayne Ltd and commenced joint Clyde and West Highland operations under the new name of Caledonian MacBrayne, with a combined headquarters at Gourock.