Locomotive Mask is a Masked Monster from the Black Cross Army, deployed by General Magman during the middle portion of the series. Its design is inspired by a steam locomotive, reflecting its primary function as a high-speed, tireless pursuer. The creature was equipped with a special radar computer attached to its leg, which allowed it to scan and track potential locations the Black Cross Army believed might be the secret headquarters of the Gorengers. Its main mission was to run continuously through various sites, using the radar to pinpoint the enemy base while evading capture. In terms of personality, Locomotive Mask exhibits a single-minded, machine-like dedication to its task, showing no hesitation or deviation from its orders. It does not display complex emotions or personal ambitions; its motivation is purely to serve the Black Cross Army's objective of destroying the Gorengers. Its key relationship is as a subordinate to General Magman, acting as one of his field agents. It has no notable interactions with other characters beyond direct combat with the Gorengers. The creature appears only once, in episode 45 of Himitsu Sentai Gorenger, and does not undergo any character development or change. Its notable abilities include immense running speed and stamina, allowing it to travel non-stop over long distances, and the integrated radar computer for reconnaissance. In combat, it relies on its locomotive-themed physical attacks and its ability to generate steam. It is ultimately defeated when the Gorengers use their team finishing move, the Gorenger Hurricane, which transforms into coal that lodges within its steam pipe, causing it to explode.