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The bolts can be used for various upgrades to your [[train]]. You can either upgrade an already existing wagon to perform better. You can buy a new wagon that can fulfill another task or you can upgrade your engine. Upgrading your engine will slow down the train and will allow you to move into a new [[Biomes|biome]].
The bolts can be used for various upgrades to your [[train]]. You can either upgrade an already existing wagon to perform better. You can buy a new wagon that can fulfill another task or you can upgrade your engine. Upgrading your engine will slow down the train and will allow you to move into a new [[Biomes|biome]].
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+'''Special (orange) bolts''' are available only once per biome and count as two regular bolts. They are furthermore necessary to unlock the final engine.