A Depot Protection System (DPS) is a system designed to protect staff and equipment by ensuring the safe and controlled movement of rail vehicles into and out of train maintenance depots, a process sometimes known as train movements or shunting. This allows train maintenance operations to be conducted without endangering the safety of staff, and damaging other maintenance equipment in the depot. The most important asset in the depot are the people working there, therefore the depot protection system needs to deliver the highest level of personnel security.