Three potential routes for the then called Metro North were published by the Railway Procurement Agency in February 2006. The first route option went through Finglas and made use of the former Broadstone railway alignment. The second route option went through Ballymun and was eventually adopted as the final route. The third route option went through Whitehall. After public consultation, the RPA announced in October 2006 that they had selected a routing known as the 'East/Central Combined Route'. that ran through Ballymun. A slightly updated route, with changes in proposed station names, some modifications to station locations, and details of proposed overground and underground routes through Swords was released by the RPA in March 2008.