In the heart of Algeria’s Sahara Desert, Chinese state-owned giant China Railway Construction Corporation (CRCC) has completed laying track on the PK330 Bridge, a final and critical link in a new railway designed to unlock the nation’s mineral wealth. The 6km (3.7-mile) bridge is part of the 950km railway linking the Gara Djebilet iron ore deposit in southwestern Tindouf province to the industrial hub of Bechar in the northeast. It was the “most technically demanding railway engineering feat...