The Kettle Train is a magazine story.
One morning, Molly has boiler ache. The Fat Controller books her in at the Works for a checkup. Before she leaves, she goes to the wash down. There she sees some workmen putting a kettle on. When it boils, Molly tells them. Later, the Fat Controller needs an engine to take a coal train. Molly volunteers, and as she is leaving the workmen comment that she sounds more like a kettle train than a coal train.