The story begins with Gordon, a proud engine who prides himself on his impeccable record, boasting, "Me, who has never had an accident." His arrogance is on full display as he mocks Henry, questioning if it is "decent" or "right" for an engine to come off the rails. Gordon dismisses his own past technical mishaps—such as "jammed whistles and burnt safety valves"—as merely "high spirits," showcasing his hypocritical nature and inflated sense of self-importance.
Gordon's downfall is triggered by his resentment toward pulling a train of "trucks" rather than his preferred coaches. His attitude is described as "sulky," and he explicitly grumbles, "I won't go, I won't go." Driven by a desire to sabotage the operation, Gordon attempts to jam the turntable—a maneuver he had performed previously. However, his plan backfires spectacularly. He loses control, "slithering down the embankment" and settling into a ditch. This moment of failure is the direct consequence of his arrogance and refusal to cooperate with his crew.
Once stuck in the mud, Gordon finds himself in a position of complete vulnerability. His driver and fireman provide a harsh reality check, telling him, "You're stuck, you silly great engine." His disgrace is compounded by Sir Topham Hatt’s indifference, who orders, "Oh, leave him where he is now. We haven't time to bother with him now."
Gordon’s misery is further amplified by the external world: a "family of toads" croaks at him, and local children mock him with a song: "Silly old Gordon fell in the ditch." Being forced to listen to this taunting while lying in the mud serves as a profound blow to his ego, forcing him to confront the reality that he is no longer the invincible engine he believed himself to be.
By evening, the process of recovery begins. Using "powerful jacks" and the combined strength of James and Henry, the crew eventually pulls Gordon back onto the rails. The story concludes with a humbled Gordon crawling home, now described as a "sadder and wiser engine." This transformation highlights the central theme of the narrative: pride comes before a fall, and true wisdom is gained through the recognition of one's own fallibility.