A policeman stands guard under a stretch of the new high-speed rail line between Xinjiang's capital Urumqi and Turpan, June 3, 2014. China showed off its first high-speed rail link to the restive far western region of Xinjiang on Tuesday, promising that it could guarantee the security of an important economic project despite a recent serious escalation in violence. REUTERS/Michael Martina (CHINA - Tags: BUSINESS CONSTRUCTION TRANSPORT)