Subway lines L9 and L10.

Barcelona, Catalunya.

With its 48 km and 52 stations, it was supposed to be finished in 2007 and become the longest underground line in Europe. In 2010 the eastern branch (12 stations) was opened to the public, but the rest of the line remains closed, although the western branch is almost completely finished. The L9 to the airport is scheduled to open in 2016, but there are no plans for the L10 to the industrial area Zona Franca. The original budget was €2.5 billion, but during the course of the years the budget has increased to €16 billion.