Norsk Transport AS was a railway- and shipping company responsible for the transport of chemicals from Norsk Hydro Rjukan. A subsidiary of Norsk Hydro, the company was founded in 1907 and operated until 1991.To transport the products to the coastal port at Skien, Norsk Hydro needed to build an extensive railway network. Cargo was stored in tank cars and transported down the 16-kilometre (10 mi) Rjukanbanen to Mæl, where it was transferred to the Tinnsjø railway ferry.