ALFA-X is a Shinkalion unit based on the experimental Shinkansen train of the same name in Shinkansen Henkei Robo Shinkalion. It serves as a powerful, advanced model designed for high performance and cutting-edge technology. In the series, ALFA-X plays the role of a special combat Shinkalion that supports the main cast during major battles and showcases the next generation of Shinkansen transformation systems. It is portrayed as a symbol of innovation, speed, and elite rail defense capability.