A pair of dual-fuelled feeder boxship newbuilds ordered by Seaboard Marine in China appear to be costing significantly more than anticipated.

Parent company Seaboard Corp confirmed that its Miami-based marine division had inked contracts to build two small dual-fuelled container ships for a price of $49m each.

The company signed an order in June for two LNG dual-fuel 1,450-teu feeder ships at Nantong CIMC Sinopacific Offshore & Engineering.