He therefore entered a corridor and began pilgrimage.

It was seemingly hopeless.

The seats were filled with coats or sticks or papers; every type of officer was engaged in bestowing himself and his goods; and the general atmosphere struck him as being precisely that which one experiences as a fresher when one first enters hall for dinner at the 'Varsity.

The comparison was very close.
First-year men--that is to say, junior officers returning from their first leave--were the most encumbered, self-possessed, and asserting; those of the second year, so to say, usually got a corner-seat and looked out of window; while here and there a senior officer, or a subaltern with a senior's face, selected a place, arranged his few possessions, and got out a paper, not in the Oxford manner, as if he owned the place, but in the Cambridge, as if he didn't care a damn who did.
Peter made a horrible hash of it.

He tried to find a seat with all his goods in his hands, not realising that they might have been deposited anywhere in the train, and found when it had started, since, owing to a particular dispensation of the high gods, everything that passed the barrier for France got there.