The Follo Line (Norwegian: Follobanen) is a planned 22.5-kilometer (14.0 mi) high-speed railway between Oslo and Ski, Norway. Running parallel to the Østfold Line, it will be engineered for 250 km/h (155 mph). Terminal stations will be Oslo Central Station and Ski Station. Most of the line, 19 kilometres (12 mi), will be in a single tunnel, which will be the longest railway tunnel in the country. Construction is estimated to start in 2014, and may be completed by 2020/21.