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.
She quickly discovered the DYNAMAC and Geoffrey St. John quickly discovered her. Soon, Geoffrey's men, Dolph and Jean-Claude, attempted to stop the engine of the Robotnik Express and accidentally activated a fail-safe and the DYNAMAC in the process. The DYNAMAC then went up against Sonic, Geoffrey, Sally on the still moving train and Rotor and Antoine on their plane. Sonic then managed to disable the DYNAMAC's systems using a gadget supplied to him by Rotor and Dolph then fired on the DYNAMAC after Jean-Claude saw Geoffrey's signal, completely destroying the robot.
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.
Apprearances in other mediaThe Robotnik Express appears in the titular episode "The Robotnik Express" of the Adventures of Sonic the Hedgehog television series. It was a goofy-looking train used for transport of Dr. Robotnik's weaponry, and was manned by both Scratch and Grounder.
The Robotnik Express was used to deliver a shipment of bombs to Robotnik's Emporium of Devastation, Destruction and Demolition, but it was hijacked by Sonic, Tails and Da Bears before exploding at Robotnik's bomb-making facility.