Eamon Ryan (Dublin Bay South, Green Party) | Oireachtas source

We are not but one looks at it all when making a public procurement decision. The following is a rough, broad and outline analysis. A light rail option might accommodate 10,000 passengers per hour at full capacity with trams running every 90 seconds and so on. The difference with the metro option is that it is a continuous, segregated, driverless system, which could accommodate 20,000 passengers per hour. Those sorts of numbers will not be there from the start. It will take time for all that housing to be built and for numbers to build up. The exact numbers from the airport are conditional on a range of other factors. This is not just an airport metro. It is more about the development of the north side and a high quality public transport for all the neighbourhoods through which it goes.