The Follo Line (Norwegian: Follobanen) is a 22.5-kilometer (14.0 mi) high-speed railway under construction between Oslo and Ski, Norway. Running parallel to the Østfold Line, it will be engineered for 250 km/h (160 mph). Terminal stations will be Oslo Central Station and Ski Station. Most of the line, 19 kilometres (12 mi), will be in a twin-tube tunnel named the Blix Tunnel, which will be the longest railway tunnel in the country. Construction started in 2014, and is scheduled to be open in 11 December 2022. The Follo Line will increase capacity from twelve to forty trains per hour along the South Corridor, and will allow express and regional trains to decrease travel time from Ski to Oslo from 22 to 11 minutes. The line was prospected to cost over 26 billion Norwegian krone (NOK) in 2014