A young boy and railfan, Hayato, Accidentally discovers that his father is part of a secret organization. The organization combats mysterious beings with Shinkalions, Bullet trains that turn into giant robots. As he meets the Ultimate Shinkalions who are claimed to be the Kings of the Shinkalions. Shinkalion U1 Nichirin and Shinkalion U2 Tsukikage, AKA Kinya and Gintoki. Hayato shows a surprising amount of aptitude as a Shinkalion driver, Based on him using an application on his father's tablet that he mistook for a mobile game. Despite initial concerns from the adult members of the organization about having children as pilots, Hayato joins several other kids and the Kings in using the Shinkalions to willingly fight against evil.

To protect the peace and safety of the Island of Sodor, combat! Steamie Transform Robot, Steamerion! This is a crossover between Thomas & Friends and the 2018 Japanese railway-based anime series Shinkansen Henkei Robo Shinkalion, taking place 1 year after the event of Thomas and the Royal Engine. The event of Thomas & Friends: All Engines Go! won't be canon to this fanfic. Either way, enjoy!