ZURICH (Reuters) - Siemens has won its largest ever rail infrastructure order, the German industrial company said on Friday, with an 800 million euro ($978 million) contract to upgrade the signalling equipment of the Norwegian national railway.

The order is intended to modernise the entire Norwegian rail system with digital technology and make it compatible with the European Train Control System.

Siemens also signed a 25-year maintenance order as part of the deal with Bane NOR, the state-owned agency responsible for Norwegian rail infrastructure.

($1 = 0.8176 euros)

(Reporting by John Revill; Editing by John Miller)