Rocking About is a magazine story.
Duncan derails whilst rocking and rolling down the line. Rusty saves him and a few days later, Duncan is shipped to the Mainland to take part in a narrow gauge railway exhibition. On the way back, the sea gets very rough. Duncan begins to feel ill and worse is to come. Whilst being craned onto a flatbed, the crane jams and Duncan is left swinging about in the air. For a while afterwards he behaves but is soon back to his old self.