Infinity Train was cancelled, but series creator Owen Dennis dropped cryptic clues of a Book 5 renewal behind the scenes. Was Infinity Train Book 5 officially confirmed? The answer revealed itself at the new Infinity Train art event at Gallery Nucleus. Spoiler alert: you won't be happy.
After Cartoon Network decided to cancel Infinity Train following the release of Book 4, fans have constantly requested a renewal. It's one of Cartoon Network's best shows in years, and many of the long-running mysteries have yet to be solved. Infinity Train Book 5 would be focused on Amelia, yet it never became a reality...
SOURCE: https://youtu.be/bR08foBBFzc