The flags of Iran, Afghanistan and Tehran-based Abad Rahan Pars Road & Construction Co. fly above a railroad work camp west of the Afghan... BILL VARNER / BLOOMBERG NEWS The flags of Iran, Afghanistan and Tehran-based Abad Rahan Pars Road & Construction Co. fly above a railroad work camp west of the Afghan city of Herat, signaling another commercial incursion from across the border. Surrounded by a mud-brick wall in the style of an ancient desert fortress, the site houses 1,000 Afghans and Iranians building tracks to link Mashhad in northeastern Iran with Herat, about 200 miles away. The line will run alongside a highway the company completed in 2006 and transmission wires that feed Iranian electricity to Herat's 350,000 residents. "Every single day, Iran is trying to have more influence, and where there is money, there is...
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