{At higher train levels, Train Core is mandatory for upgrading the train. Moreover, it can also be used to reduce the materials needed for a module or train upgrade, even if it's not a mandatory resource requirement for upgrades.}
{Upgrading to Train Level 21 and above requires Train Cores. Not only that, but Train Cores could also be used to create a subordinate train and grant someone Train Conductor Authority.}
{As long as they haven't been branded as a cultist, even Wanderers who abandoned their Train Conductor Authority can regain it using a subordinate train created by a Train Conductor.}
{Furthermore, station world natives can also be granted a Train Conductor Authority and the right to become the Train Conductor of a subordinate train. However, a subordinate train, true to its name, is still subordinate to the Train Conductor who created it.}
