Answer:
I come with a train and go with a train and the train doesn't need me but can't go without me.
I have thirteen hearts but no body or soul. What am I?
I hide but my head is outside. What am I?
I am the kind of ant that's good at math.
I go in dry and come out wet. The longer I stay in, the stronger my surroundings get. What am I?
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.