There are only two professionals in Korea

Train operation chart manager

The main task is to plan the train operations of all railway lines across the country by drawing up a van diagram in units of hours, minutes, and seconds each day. The photo is a daily timetable for only one section of the Tokyo Shinkansen train. Their job is to combine dozens or hundreds of these to ensure that all lanes move without a hitch.

Among the 30,000 employees of the Korea Railroad Corporation, there are only two people who produce this chart. In other words, if these two people go on strike, at least 1/3 of Korea’s logistics distribution and transportation means will not work, so the treatment of these two people is said to be equivalent to national strategic assets.