Answer:
I can be short and sometimes hot. When displayed I'm never cold. What am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
I hold two people together but touch only one. What am I?
the only amusing part of the body
I am often sold by children entrepreneurs in summer time
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?