GTS is a yellow train that appears to be like Thomas the tank engine but the thing is He is missing the left half of his face. The hole there reveals parts of an endoskeleton head and red and green wires. If you look closely, you can see what appears to be a corpse face inside of GTS. It is unkown who this is.
Golden Therdos Schmidt starts laying next to Withered Thomas in the Scrapyard. He will then move through the Main Hall before appearing in the front door. The player must shine the light at him to stop him. Failing to do this will result in a jumpscare and a game over.