Subway Tales: Ones and Twos

Years ago, I wrote about how the 1 trains travel in packs of 2. I ride it pretty often... around 2-3 times a week and it always seems to follow this pattern no matter the time of day. When the platform gets crowded, I know to let the train pass because the one right after will be empty. Now I have the numbers to prove it because they installed a countdown info. screen in the station. Sure enough, it read 10 minutes for the next train and 13 minutes for the one right after. I arrived today at rush hour to a crowded platform. The info. screen was right on the money. Everyone sandwiched into the first train. The next one was really right behind and empty enough for people to sit down.