The happy go-lucky Joe „Puffa“ Pufferson has no time to stop. With the Great Depression over his funnel, unemployment could hit him any second. But he doesn‘t work himself up about that. Instead, he tries to cheer up the inhabitants of Upriver and Bigg City, such as his friends Ten Cents, Sunshine and Terrier. But with a reduced railway staff and a lack of rail maintenance accidents will happen, now and again.