It's a simple rule, in this country....
If something makes sense we won't do it, we'll just talk about it from time to time, with politicans using it to get a bit of publicity, squander a bit of taxpayer money toying with the concept, but then find a rediculous excuse not to proceed. If you want an example, just look do a little research on DART Underground.
The reverse is equally true, if it's a rediculous idea, we'll proceed with it - case in point being to build the Childrens Hospital in the middle of town, with restricted traffic access etc. Not to be outdone with initially selecting a bad location for it, our geniuses went a step further, and relocated the new hospital from a bad location, to an even worse location, having initially squandered quite a lot of money on the original plan to put it at site of the Mater hospital !
How we've continued to encourage the enlargement of Dublin City and Dublin Airport, rather than invest in good infrastructure elseehere in the country, to connect cities properly by rail, road and air, build decent housing at more affordable prices, encourage and support inward commercial investment etc.
We'll be lucky to see Metro North up and running, during many of our lifetimes, not alone see additional train lines put in, to facilitate a regular Dublin-Belfast service, and a seperate, frequent, commuter service to transport people from Drogheda, or North County Dublin, into Dublin City, or to the airport etc.
Despite the above, we persist in electing the same individuals, and retain the same senior county council staff, civil servants etc. What's that saying about making the same mistakes, time and time again, but expecting a different result...?