section_path: Economy/Transport
section_name: Transport
paragraph_text: Transport
  
  The country's three main international airports at Dublin, Shannon and Cork serve many European and intercontinental routes with scheduled and chartered flights. The London to Dublin air route is the ninth busiest international air route in the world, and also the busiest international air route in Europe, with 14,500 flights between the two in 2017. In 2015, 4.5 million people took the route, at that time, the world's second-busiest. Aer Lingus is the flag carrier of Ireland, although Ryanair is the country's largest airline. Ryanair is Europe's largest low-cost carrier, the second largest in terms of passenger numbers, and the world's largest in terms of international passenger numbers.
  
  Railway services are provided by Iarnród Éireann (Irish Rail), which operates all internal intercity, commuter and freight railway services in the country. Dublin is the centre of the network with two main stations, Heuston station and Connolly station, linking to the country's cities and main towns. The Enterprise service, which runs jointly with Northern Ireland Railways, connects Dublin and Belfast. The whole of Ireland's mainline network operates on track with a gauge of 5 ft 3 in (1,600 mm), which is unique in Europe and has resulted in distinct rolling stock designs. Dublin's public transport network includes the DART, Luas, Dublin Bus, and dublinbikes.
  
  Motorways, national primary roads and national secondary roads are managed by Transport Infrastructure Ireland, while regional roads and local roads are managed by the local authorities in each of their respective areas. The road network is primarily focused on the capital, but motorways connect it to other major Irish cities including Cork, Limerick, Waterford and Galway.
  
  Dublin is served by major infrastructure such as the East-Link and West-Link toll-bridges, as well as the Dublin Port Tunnel. The Jack Lynch Tunnel, under the River Lee in Cork, and the Limerick Tunnel, under the River Shannon, were two major projects outside Dublin.