The Asker Line (Norwegian: Askerbanen) is a 9.5-kilometre (5.9 mi) railway line between Asker and Lysaker in Norway. The line runs along the same corridor as the Drammen Line, offering increased capacity, speed and regularity on the rail network west of Oslo. The first part opened in 2005, and in 2011 an extension opened from Sandvika to Lysaker. An extension to Skøyen in Oslo will perhaps be built after 2020. Most of the railway is in tunnel and is dimensioned for 160 km/h (99 mph) running. The entire railway is electrified at 15 kV 16 2⁄3 Hz AC. The first section cost NOK 3.7 billion, while the second is budgeted at NOK 2.7 billion.