You can hear them. The low rumbling as they pull into the station. The high whining as they race along the tunnel tracks. Even in the dark you can hear the metal monsters going about on the lines. Even in the darkness you can tell they're there.
You can smell them. The indescribable aroma of the underground. The beautiful odour as you breathe in the air around you. Even in the dark you can smell the pleasing perfume lurking in every corner of the spaces. Even in the darkness you can tell they're there.
You can feel them. The small tremors caused by their movement. The everyday shaking as they travel to their destinations. Even in the dark you can feel the quick quivers reminding you that you are not alone. Even in the darkness you can tell they're there.
