Oslo - Swiss-based Stadler Rail Group was selected Tuesday to deliver new regional trains worth 4 billion kroner (739 million dollars), Norwegian train operator NSB said.

"This is NSB's largest single contract to date and a historic deal," NSB chief executive Einar Enger said in a statement.

The Norwegian train operator was to buy 50 trains consisting of five cars each from the Swiss group, and had an option for a further 100 trains known as Flirt (Fast, Light, Innovative, Regional Train).

India's state-run miner National Marine Dredging Company (NMDC) has signed a memorandum of understanding (MoU) with Global miner Rio Tinto to consider investment and development opportunities in India and globally.

NMDC and Rio Tinto will hold a 50% equity stake each in the proposed joint venture.

Under the arrangement, NMDC will have access to Rio Tinto's technologies. The JV company will initially mine Iron and is likely to explore and mine other mineral reserves globally as well.

NMDC has already signed an agreement with Rio Tinto to import its "high smelt technology" for iron ore mining.