Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Delta is a Brussels metro and railroad station in the municipality of Auderghem/Oudergem, Brussels Capital Region. It is also the site of the primary maintenance facility for all heavy metro rolling stock. Because of this, Delta originates the Brussels Metro s earliest services in the morning and is also the last station where metro trains terminate at night. The maintenance complex also services a large fleet of buses.