Duke

Duke is a 12 year old large black train with a very modest personality.

He is the strongest train in train world (Fountain Plaza), Also he loves to spend his times in darker areas and get training to protect the train world and his friends.

Personality
In Season 1, he was portrayed as evil and destructive. (This was due to the fact that he was infected with a virus). In his healthy state, Duke looked kind, quiet, and willing to do anything to help his friends.

In Season 2, he is portrayed as one of Train X's henchman's, mostly stealing orbs for Train X and causing mischeif.

Trivia

 * His eyes turn red when he is infected in S1.


 * In addition, in Season 1, after being cured of the virus, his eyes were gray, and in season 2, they were black.
 * When he laughs and speaks the movements are very subtle
 * When Duke speaks in season 1, it is visible that duke's mouth doesn't open for some reason. But in season 2, Duke has a mouth when he speaks
 * Duke becoming a villain in season 2 was widely criticized for reverting most of his character arc.
 * In S1 EP 18, It is noted that Duke almost killed Kay when he was infected, but luckily Victor arrived on time.