Two potential routes for Metro West were published by the Railway Procurement Agency in January 2007, with a number of sub-options also included. Following discussions and a public consultation process, the preferred route was announced in July 2007. This route started at Tallaght, then continued on through Belgard, Clondalkin, Liffey Valley, Blanchardstown. Stops were also planned for the National Aquatic Centre and Abbotstown, before continuing in the direction of Sillogue and Harristown. Following Harristown it would link with the Metro North, after Northwood and before Dardistown station. The line was expected to be 25 km long.