This is the final article in the series of negatives and slides from my collection that I have attempted to colourize with the aid of photoshop. For a very few of these slides, photoshop has not worked well and I have resorted to a more comprehensive colouring program that uses multiple layering like an impressionist painting to achieve the coloured image. This I dislike as it leads to some curious effects, but it does a better job on crowded scenes. The previous article featured the privately owned Clyde steamers. In this article the steamers of the Caledonian Steam Packet Co., the Glasgow & South-Western Railway Co., and the North British Railway Co., are portrayed. A slide of steamers at Rothesay Pier. The funnel colours attract immediate attention. The only easily recognized steamer is the Caledonian Steam Packet Co.’s Galatea with her two rather awkwardly spaced funnels....