The Department of Public Utilities (DPU) Transportation Oversight Division is responsible for the oversight of equipment safety and operations for the Rail Fixed Guideway Public Transportation Systems (RFGPTS) in the state. The MBTA is the only Massachusetts transit authority which operates a RFGPTS. The Division annually reviews, tests, and approves the System Safety Plan created by the MBTA, along with monitoring of the MBTA’s compliance with the Division’s System Safety Program Standard. The Division also performs random inspections of MBTA light and heavy rail subway cars and operation facilities which include all carhouses. Division staff review and participate in internal safety audits to further enhance compliance and safety plans. The Division also conducts external safety audits which are designed to monitor compliance with program requirements.