The downside is the extra tunneling will cost considerably more and will add some months to the project for no benefit in terms of service
Yes it will cost more, but why should we have to take the pain of that cut in costs when the rest of the line in underground. You wouldn't see an elevated sturcture coming up in Tolka park or All Hollows and running up the drumcondra road right through bertie's constituency.
The benifit will be realisable in using a green field site, which is not located in a residential area to bore out the tunnel making the project much easier for contractors, residents and commuters.
I know that it will cost more but if you were facing 3/4/5 years of living next to one of the largest construction sites in the country you would want it underground. Plus I have absolutely no faith in the design or implementation of an elevated sturcture which will be an increadibly imposing structure when finished.
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