Infinity Train - Ending Explained

The series' greatest twists involve the unveiling of the train's logic. It is revealed that the train isn't a malicious prison, but an automated, neutral system that became corrupted when Amelia overthrew the original conductor (One-One) to create a car where her dead husband was still alive. This 'Original Sin' of the series—trying to halt change—is what creates the chaos that later passengers must navigate. The most devastating turn is Simon's death in Book 3; unlike most protagonists, he is not saved at the last second. His number rises to cover his entire body before he is literally consumed by a Ghom, proving that the train's 'mercy' is conditional on the passenger's willingness to be honest. The series ends without a final explanation of the train's origins, reinforcing the idea that the passengers' growth is more important than the mystery itself.

Many viewers and critics interpret Lake's arc as a trans allegory, specifically focusing on her rejection of a 'birth identity' and the struggle for a name and body that reflects her true self. Others view the train as a secular Purgatory, where the 'wasteland' is a literal void and the passengers are souls caught in a recursive loop of their own making. A more cynical 'Simulation Theory' suggests the entire world is a massive AI experiment where the passengers are merely data points for a cosmic learning algorithm managed by One-One.