Hitachi Rail Italy, born out of Hitachi's (>> Hitachi, Ltd.) purchase of AnsaldoBreda from Finmeccanica last year, won the biggest chunk of the contract, to build 300 trains.

A person familiar with the deal told Reuters that Hitachi's contract, consisting of trains with at least 450 seats, was worth about 3 billion euros. Trenitalia did not say how much it would pay each individual supplier.

Alstom (>> Alstom) will build 150 medium-capacity trains, Trenitalia said in a statement. Stadler won the bid to build diesel-powered trains, but Trenitalia said it reserved the right to re-evaluate the Swiss firm's proposal.

Trenitalia is part of national railway operator Gruppo Ferrovie dello Stato , in which the government plans to sell a stake as part of a long-delayed programme of privatisations to reduce its huge public debt.

Canadian firm Bombardier (>> Bombardier, Inc.), Spain's CAF (>> Construcciones y Auxiliar de Ferrocarril) and Hyundai (>> Hyundai Corporation) had also presented bids to build the trains.

(Reporting by Isla Binnie and Silvia Ognibene; Editing by Philip Pullella and Susan Fenton)