Locomotive Mask is a Masked Monster sent out by Magman to run throughout several locations non-stop with a special radar computer on its leg; using the radar, it runs through several locations believed by the Black Cross to be the secret headquarters of the Gorengers. When Peggy and Asuka initially encounter it, Locomotive Mask easily crushes them as it runs right through them and even throws Green Machine high in the air throwing Midorenger into a tree. As it continues its run, Daita tries his hand trying to slow it down but the train Masked Monster ignores him and even proves his power and speed with ease. When the Gorengers find out about Locomotive Mask's mission for Magman, they become even more determined to stop it before it finds the location of their base.