Mr. Herb tells Diesel that the youngest freight train, Loco, should do the job well for the freight train. He says no train knows as much about the freight train as he is. Loco learns to work alongside Diesel in a harbor or quarry. Thanks to Diesel's well-taught knowledge, Loco works well even it's a first time. Everyone praises Loco, who is doing a good job, and Diesel is getting sad about praising Loco without anyone seeing what he has taught.