Monorail is a method of travel in Lightning Returns: Final Fantasy XIII. By expending gil and time, Lightning can easily move between the four main locations of Nova Chrysalia. It costs 100 gil to ride the monorail. Riding the monorail expends 1 hour of the world's time.
The player can find the train schedules posted at the stations, but using Chronostasis can mess up the schedules, as using it after the train has arrived doesn't prevent it from leaving, thus setting the player back until the next one even though the in-game time is frozen.
Taking each route earns the Perfect Passenger achievement.