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EI-04 was a "Triple Locomotive Robo." Created through Polonaise's infusion of Zonder Metal into Youichi Yamanoguchi, a troubled boy who envied the power of steam locomotives. Fused with a nearby steam locomotive to create a Zonder Robo with firebox arms that launch a rapid barrage of coal-shaped fireballs.
This Zonder Robo's core reverted to Zonder form and escaped before Purification could be performed.