At some point, we've collected 13 wagons, and when we complete another loop, the game grants us an additional wagon. Initially, the train had a 13/14 indicator, but when we tried to add another wagon, the game wouldn't let us (it was stuck in the player's hands). And then there's an occasion when the wagon just vanishes into thin air, I think it needs to happen under certain conditions to trigger this bug, but I can't quite remember. Pressing the reset button restores the wagon either to storage or to the shop/chest (original location), but it still won't allow us to add the wagon.
#Cannot add more than 13 wagons to the train
hollow kestrel
outer crane
I can confirm this, necro thread
@indigo dew @solid trail @covert nacelle
Devs we can give you the savegame etc for this if you need it.
Happened on todays experimental a few hours ago
waxen kindle
We're making the 13 wagons cap explicit for the next version to avoid this buggy behaviour.
We can think of giving something else or increasing the cap in the future if there is a need for it
outer crane
(For the record: Thomas got the savegame of aboves clip from me)