Based on the story "Leaves" from Gordon the Big Engine.

Gordon is given goods work after refusing to get a wash down and spraying James with mud. He is too muddy to pull the Express, making James very boastful about getting the job. He becomes so conceited he does not pay attention to Gordon's warning about the muddy leaves on the hill.

Based on the magazine stories "The Post Train" and "After the Last Train."

At night, Thomas and Percy have the important job of transporting the mail, but they are afraid that Harold will start stealing their traffic. Their fears, however, are dispelled after Thomas takes an important visitor home and bad weather grounds Harold.