The final season (or so it seems) of Infinity Train is upon us and this time it’s a Duet! That’s actually the title. We follow two passengers, Min-Gi and Ryan on their shared journey through the passenger cars of a mysterious train that seems bent on solving their emotional hang-ups, or letting them die trying. It’s a prequel season for this fourth installment and we can only hope that more will be announced in the future. But as of right now… this train is… finite.