Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
There are traffic estimates from the very simple (multiplying city populations with some factor) to the very complex (taking into account population according to travel times to the stations, expected fare policy, expected GDP growth, rival modes of transport), and each can go wrong. But, for your example, the picture is relatively simple: by comparison to Eurotunnel, we can say that any structure would be more expensive with today's technology while demand is lower, so definitely uneconomic now. If the Holyhead tunnel shall ever become viable, then due to some drastic reduction in construction costs.

For instance, the Dublin/London route is one of, if not the busiest air route on the planet.

Checking Wikipedia and then Eurostat (Transport > Air transport > Air transport measurement - passengers > Detailed air passenger transport by reporting country and routes), I find the number for 2014 is:

  • Dublin to London Heathrow: 1,650,394
  • Dublin to London Gatwick: 990,590
  • Dublin to London Stansted: 808,934
  • Dublin to London Luton: 326,336
  • Dublin to London City: 230,946
  • Dublin to London, total: 4,007,200

This does appear to be the second-busiest international route, but several domestic routes around the world are busier. Methinks a rail route could draw from a wider base (for a start, also from the passengers of air routes to northern England), but I don't see where you'd find 10 million passengers which Eurostar now has.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Sun Sep 13th, 2015 at 05:45:24 PM EST
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