Will Dublin ever get its first metro?

Dublin is desperate for a metro. It's one of the most congested cities on the planet and is one of the last European capitals with no direct rail line to its airport. For decades, Ireland has been toying with the idea of its first metro but without ever making proper in-roads towards building it.

But it seems there's now light at the end of the Dublin tunnel. Planning permission has been granted for the second time for an underground rail line running through the city and momentum is growing. The question is, will Ireland finally build its much needed metro?