CAIRO: Egypt on Tuesday signed a 15-year, billion-euro contract with French transport operator RATP Dev to manage Cairo's third metro line, the transport ministry said. The government has sought to expand the run-down network in recent years to ease the burden on the traffic-choked streets of the capital, home to more than 20 million people. In 2012 its third metro line went into operation, stretching 47 kilometres (29 miles) from east to west.