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.
The main railway station, located within the same complex, encompasses two platforms and is served by the suburban services of NMBS/SNCB line 26 linking Vilvoorde with Halle via Etterbeek. There is a direct link between the metro and railway tracks within the station, enabling transportation of metro rolling stock by way of the Belgian rail network.
Delta station is located near the intersection of "Boulevard du Triomphe/Triomflaan" and "Boulevard des Invalides/Invalidenlaan" and provides access to the adjacent campus Plaine of the Université Libre de Bruxelles and to the campus Etterbeek of the Vrije Universiteit Brussel. The station was inaugurated on September 20, 1976, as part of the first heavy metro segment of the network, located on the branch from Mérode to Beaulieu, which is now a part of line 1A.
Delta is notable for being the only station in the Brussels Metro network to be named after a feature of itself rather than after a street name, neighborhood, or other adjacent location: The name derives from the triangular shape of the maintenance complex as seen from the air, which is reminiscent of the Greek capital letter Delta (Δ).
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