During the early twenty-first century, the Austrian Federal Railways began to reengineer elements of the Arlberg line with contemporary safety features. As such, the Arlberg Railway Tunnel was subject to a package of works costing 210 million euros during a temporary closure, this included the addition of eight new evacuation and rescue passaged between it and the adjacent Arlberg Road Tunnel; other safety-related changes included a water supply (for fire-fighting purposes), new orientation lighting, emergency telephone and radio facilities, and overhead line disconnection functionality. These alterations were tempered by a desire to keep the existing tunnel structure relatively intact, avoiding lengthy interruptions to operations; however, the safety measures introduced maintained compliance with existing guidelines and knowhow. Furthermore, the loading gauge throughout the tunnel was expanded by lowering the track bed, while a permanent road surface was also added so that emergency vehicles could more readily move inside as well; the renovated tunnel was put back into service during late 2010.