Compartment 06
In the past, Theodore would claim an empty compartment and just let whoever wanted to join him sit down. This year, he'll be joining Draco's train compartment. Not that he'll be much more pleasant or social than he usually is. He'll read, stand up and walk up and down the train a couple of times, and eventually ball up his robes behind him as a makeshift pillow, sit back and close his eyes... he's not asleep.
He also won't be buying snacks, but packed a lunch for himself consisting of a bag of crisps and an apple.