DART+ (DART Expansion)

If they go high density with housing on that site, would it be worth putting in a new Dart station half way between Clontarf Road and Killester?

Yeah ideally Killester station would be at the north east corner of the golf course, off Collins Ave. Not sure that moving it is a priority though.

Better off just moving Killester a bit more south, and locate the station where the golf course is.

Ehhhh, Killester quad tracking may not be easy but neither will the other stations, and if anything I think might be one of the easier stations to quad track as there are plenty of large back gardens to use. Which is also why I believe it is important to keep it roughly where it is, and then open a new station for a redeveloped Clontarf Golf Club, as the spacing would be pretty even for the first few stations.

tbh, I think if the location of Killester is a problem we might as well give up any hope of quadtracking. Harmonstown and Raheny would be just as difficult to quadtrack, and Killbarrack (which is likely the hardest to upgrade) would just have to be closed.

That said I would support shifting the station and platforms about 50-75 metres south to Collins Ave as someone else said. That could add a little extra to quadtrack (although I am not sure if it is practically any different), but more importantly it would be an easy connection to the bus stop which serves the N4 and 104/8.

Moving the station removes the need to take a lot of back gardens along that section.

You don't need to be so defeatist. Not every problem carries equal weight, and some solutions are easier than others.