The Czech Republic has the densest rail network in the world with  of tracks. Of that number,  is electrified,  are single-line tracks and  are double and multiple-line tracks. České dráhy (the Czech Railways) is the main railway operator in the Czech Republic, with about 180 million passengers carried yearly. Maximum speed is limited to 160 km/h. In 2006 seven Italian tilting trainsets Pendolino ČD Class 680 entered service.