In fairness, the London - Paris has a huge catchment area so can justify the capital cost associated with building same, even then its operating at an overall loss, The total cost of the Channel Tunnel will make it uneconomic for many years to come.
Dublin Cork is approx 150 years old and with todays numbers using it,it is questionable it would be built today in its entirety.
However with the end of oil and climate change, the dynamics of building such railways might again come in to focus!
