When the train reaches Level 3, it can start changing professions.
There are two available paths for changing professions.
The first path, "Mechanical Train."
As the name suggests, it's a train made entirely of mechanical components, just like the ones they have now, with high destructive power and requiring resource mining for upgrades.
The second path, "Flesh and Blood Train."
This type of train is quite unique as all its components are made of flesh and blood, such as "Flesh and Blood Spider Legs," which are not mechanized spider legs but rather made of flesh and blood.
All components will be magically modified into "flesh and blood series components" at the Level 3 crafting station.
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The special feature of this train is its strong regenerative ability.
If any component is damaged, it doesn't need repair; it'll quickly self-repair in a short time. Furthermore, upgrading the train or its components doesn't require resource mining, just the flesh and blood of monsters.