Shell Engine is a magazine story.
Arthur is working on the Fishing Line when he sees some new sheds along the beach, along with a very bad smell. His driver explains the sheds are for roasting cockles, and the smell is from the cockleshells. Later at the station, George turns up, but he is so put off by the smell, he runs into the station wall. The road gang agrees to fix it and Arthur has an idea. Soon the wall is rebuilt, along with an image of Arthur created using the shells.