Maj. Robert Nash, the U.S. Army Corps of Engineers officer-in-charge of the renovation of the Baghdad Central Train Station sits in the station recently. BAGHDAD -- Karem recalled using Iraqi trains when he was a youngster. Back then, the Baghdad Central Train Station was notorious for nonfunctioning restrooms and the foul odor of sewerage emanating from the basement. “But the trains themselves were always clean, comfortable and a great bargain,” the 33-year-old deputy resident engineer said. Now Karem is overseeing a project that will not only re-introduce train travel to Baghdad, but will make the train station far better than...