As they were leaving Canterlot for the second time in as many days, Twilight took a moment to ask the Princess something that had been on her mind. "Princess, what IS it that Raven wants?"
Celestia shook her head "I'm afraid that Raven specifically asked me not to tell you what it is he is seeking." Twilight looked disappointed, but Celestia reassured her.
"I'm certain that you can do this, Twilight." And with those encouraging words, Twilight got onto the train and joined her friends.
The train ride was uneventful and quite dull as it was dark for most of the trip, and so everypony caught up on some much needed sleep. Raven stayed awake.
He tried, whenever he could, not to sleep.