The pink, rectangular icon on the computer screen representing the progress of PATH train 5780 blinked, as the cars rolled out on the westbound tracks from the World Trade Center station.

WSJ: PATH's Road Back Is Rocky

The completion of the single market was set in train only in the 1980s and remains a work in progress.

ECONOMIST: Fit at 50? | The

Progress has also been made on Mexico's federal prisons, with the construction of a new academy to train prison guards.

ECONOMIST: Organised crime in Mexico