If that's a night train, fuck the flight. I'd rather sleep on the train and wake up in a new city for 40$ than drive to the airport for an hour, wait on the plain for 1-2 hours, wait 30 minutes for take off, and then get an uber or something to the city center for another 20$. With a train you show up, sit down, and arrive in the center of the city where I want to be.