The image is a close-up of a sign on the door of a train. The sign is rectangular in shape and has a white background with black text. The text reads "Central Door Locking" in bold letters. Below the text, there is a message that reads "For your safety this train is equipped with Central Door Lockings. It will not be possible to open this door until the train has come to a complete stop at the platform." The sign appears to be warning passengers to not open the door until they have come to the platform.