Movie
Description
Yaemon is an elderly steam locomotive from Japanese media adaptations. Originating as the first JGR Class 400 engine and Japan's oldest steam engine, he initially operated on Japanese Government Railways. In one narrative, he transported passengers across the countryside. The arrival of a new electric engine led to mockery and incidents where sparks from his smokestack ignited hay piles, resulting in scrapping threats.

Later found stored in a shed at Tokyo Station, staff deemed him obsolete and a nuisance. His only companions were nesting mice nearby and a crow residing in his smokestack. After saving the mice from a cat, he learned of his impending demolition. This prompted the mice to repair him, removing rust, restoring his mechanics, and procuring coal. During his escape, he faced pursuit by the diesel engine Dimu and the crane car Fukku, culminating in a chase through the station.

His physical appearance varies. He is depicted as a grey tank engine with a brass dome and whistle, later marked with "やえもん" and "Yaemon" on his tanks. One version resembles a JNR 7100 series locomotive, while another combines features of an 860 and 2100 series. His whistle exhibits autonomous facial features and intelligence. In a key sequence, he displays a "Super Mode" with a red-glowing front and blue flame from his smokestack.

Personality-wise, he is occasionally grumpy but possesses a heart of gold. He exhibits emotional sensitivity, reacting to teasing with visible distress that triggers cinder-spitting incidents. During abandonment, he showed melancholy but rediscovered determination through friendships, ultimately demonstrating resilience and courage during escape attempts.

His relationships include bonds with animals like the mice Mau and Sue, the crow Kasuke, and the adversarial cat Summer. He interacts with sentient vehicles, including antagonistic modern trains like Dimu and Fukku. His rescue by a museum owner and later relocation to preservation railways, such as the North Western Railway and Caleb’s Railway, underscore themes of heritage and camaraderie among steam engines.

Key developments involve transitions from active service to storage, repeated scrapping threats, and eventual preservation. His narrative concludes with him working on coastal branch lines and occasionally assisting with postal services alongside other engines, symbolizing enduring relevance.