When foreigners come to American cities like New York for the first time, one of the things that shocks them the most is how dirty and inefficient public transportation can be. One country that has set the bar impossibly high is Japan, whose Shinkansen train is incredibly fast and practically spotless despite carrying over 400,000 passengers a day. Their secret? A team of highly synchronized efficient workers who clean each train in 7 minutes flat. Watch the incredible video below! 

The cleaning team is lined up and ready to go as soon as each train pulls in, and 7 minutes later, each cart is spotless and ready for a new batch of passengers. 

American train systems could stand to learn a lesson or two from Japan! 

Watch Kim Soo Hyun, Gong Hyo Jin, IU, and Cha Tae Hyun in Producer, the star-studded new series that goes behind the scenes of Korean variety shows: