I don't watch cartoons but just happened to read the basis for this new TV show:
Synopsis: Trapped on a mysterious train full of puzzles and perils, a headstrong 12-year-old girl must use her wits to uncover the train’s many secrets – and hopefully return home. Tulip’s mind-bending journey will find her forging friendships with One-One, a robot with dueling personalities, and Atticus, the canine king of Corginia. But with new surprises awaiting them in every car, will Tulip ever find a way off the train?
"... the highly anticipated series originated with a short film released by CN back in 2016 and follows a precocious girl named Tulip as she fights and figures her way through a train full of endless bizarre worlds, trying to find her way home."
Episode 1: "The Grid Car": Tulip, a headstrong 13-year-old girl, finds a mysterious train where every car contains its own universe.