The Robotnik Express was an express train that was used by its namesake designer Doctor Ivo "Eggman" Robotnik to transport his DYNAMAC-3000 weapon to the western side of Mobius and one of many objects featured in the Sonic the Hedgehog universe. During a recon mission to retrieve information in Robotropolis, Sally Acorn jumped on top of the locomotive and climbed inside with Nicole in hand. The Knothole Freedom Fighters and Geoffrey's men then decided to make use of the train's resources and stole them and Geoffrey then took the train itself.