What they usually do is run two monorails. I will use red and blue as examples. Monorail Red will arrive at the tomorrowland station and unload, then it will move forward, then Monorail Blue will arrive, unload and load passengers. Monorail Blue will then go backwards to Downtown Disney. The passengers will be unloaded and Monorail Blue will back up. While Monorail Blue is on it's way to Downtown Disney, Monorail Red will back up and stop at the Tomorrowland station and load passengers. When Monorail Blue backs up, Monorail Red will leave the station and go backwards to the Downtown Disney station. When Monorail Red arrives at the station it will unload all of it's passengers, and then load those in line. You must get off, even though Monorail Red will then go foward to the Tomorrowland station, and start the process all over again.