 The importance of the long-distance train is minor today, though in the past it was widely used and is now regaining momentum after the re-nationalisation of the country's commuter and freight networks.Fluvial transport is mostly used for cargo.Within the urban areas, the main transportation system is by the bus or "colectivo"; bus lines transport millions of people every day in the larger cities and their metropolitan areas as well as a bus rapid transport system known as Metrobus.