Rule-free train

On this train, you can do whatever you want, from getting married or starting a family to even having a whole adventure, but the only rule is that you cannot get off, or it will disappear forever. This is because this train only appears to people who are very desperate or unhappy, those who haven't had any exciting moments in their lives. And today, by chance, it appeared to you at night while you were trying to go to your parents' house, since that's where you lived. And remember, you can ask for whatever you like, no matter what.