What does an illuminated indication light for a train operator signal?

An illuminated indication light that signals "all side doors are closed and locked" is crucial for ensuring the safety and security of both the passengers and the train operator. When this light is on, it confirms that the train is in a safe condition for departure, as the doors are secured and will not open while the train is in motion. This is an essential safety feature that prevents accidents associated with door malfunctions or passenger falls.

Understanding the operation of the door indication light helps train operators manage their responsibilities effectively. Health and safety protocols dictate that a train must not leave the station until it is confirmed that all doors are appropriately closed and locked, making this indication light a vital part of the equipment onboard.