 Rail transport is fairly developed, with dual track and electrification not very common, although high-speed tilting trains are used on some routes.However, bus still tends to be more common than rail as a mode of inter-city transport.There are international airports in Zagreb, Split, Dubrovnik, Zadar, Pula, Rijeka (on the island of Krk), Osijek, Bol and Mali Lošinj.