Brussels S Train
The Brussels S Train, also known as the Brussels Regional Express Network (French: Réseau Express Régional Bruxellois or RER; Dutch: Gewestelijk ExpresNet or GEN) is a suburban rail system in and around the Brussels-Capital Region of Belgium. It will offer fast connections and increased frequency within a 30 km (19 mi) radius of the region, covering a territory inhabited by 2.5 million people.