An isolated incident

An underground station in a big city. A middle-aged playwright is waiting for the train. The clock has stopped. Suddenly, an employee of the metropolitan transport service appears. He has come running down the tunnel from the previous station. The public address system is not working, and he wants to alert people that the line will be closed for hours due to a specific incident; someone has thrown themselves on the track. Little by little, the strangeness and danger of the situation will increase to fever pitch, as connections gradually emerge between the protagonist and the driver.