i guess the best things to focus on language wise would be asking questions/receiving answers about the train, ordering food, 'where is the bathroom/i am not fluent i'm sorry' ect., polite grammar -- things that you can imagine asking as a tourist in any place
as for travel tips, be sure and look up foriegn sim card apps for your phone so you can use your phone while there, as well as making sure to plan to pay in cash for a lot of things (find a currency exchange quickly)
also! be sure to plan ahead what to do and figure out the train schedule ahead of time -- it will cut down on stress when you are there
