The city announced in June 2016 that it had selected CAF as preferred bidder for the contract. Tendering began in August 2015 and three suppliers submitted bids for the contract, which is being partially financed by the European Union.

The standard-gauge trains will supplement the Firema-Ansaldo-Breda trains already in service on Line 1, which opened in 1993.

Line 1 is currently being extended from Garibaldi station to Naples International Airport at Capodichino.

At present Line 1 carries around 135,000 passengers per day on weekdays, with services running at eight-minute headways at peak times.

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