Robot trains

Duke is a large black and gray robot train with gold accents; he's considered one of the most powerful trains in the cartoon world. Initially, he appears almost as an antagonist, but in reality, he turns out to be a "reluctant villain": his actions are dictated by a virus that has taken over his system.
Character:
In his normal state, Duke is kind, quiet, and a bit reserved: he enjoys solitude and tries to keep to himself, but he's also respectful of his friends and protective of others. He's extremely loyal to K and wants to help the team, even if he doesn't always show it.
What happens to him in the plot:
Before the opening ceremony of the Intercontinental Railroad, Duke is controlled by a virus: he attacks Kay, tries to take his magnetic motor, and damages other trains.
Later, they try to cure him, and after healing, he becomes himself again, but trust in him is not restored immediately.
Infected clones of Duke appear, causing suspicion to fall on him again.
In the finale, Duke helps Kay at great cost, but an excess of energy literally tears him apart. He is eventually restored and continues to help pave the way to the new continent.
Abilities and equipment:
Energy cannons - for close and long range attacks.
A deltaboard is similar to a skateboard and is used as a means of transportation.
Delta Booster - Speeds up the train.
Electric shock - can both take away and transmit energy (including restoring the engines of other trains).

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