They are the group of workers who I see every month checking the railway in front of my home. They check every single centimeter and take care that every stone is in its place. The service is not stopped during the maintenance, they just work when there are no trains so they have to stop and move to one side every two or three minutes, hard work! They guy with the flag has to tell everyone when the train is coming.
Japanese railways is one of the things I would like to have everywhere in the world. It works so perfectly and there are trains almost from everywhere to everywhere.