These ideas are pretty good. How about all characters separate for the weekend? I don't think they know or like each other enough yet to seek out each other's companionship for weekend activities. It'll give everyone an opportunity for solo-writing, and then they can all meet back up on a train again Monday. In character it's currently Friday, so that's a good amount of time and freedom for them to do whatever they need/want/get forced by circumstances to do. I may be biased towards this plan because I already know what I'm going to write.