QUINCY, Ill. — The Illinois Zephyr — a workaday locomotive and four cars sitting in the predawn darkness in Quincy, Ill. — isn’t the sleek, futuristic image of high-speed travel, but it’s what some Eastern Iowans have worked toward for years. While the effort to bring passenger service to Iowa City by 2015 still faces some political and financial obstacles, trains sponsored by Iowa’s would-be operating partners Amtrak and the state of Illinois continue to draw travelers — 1.6 million in 2010 — from the highways and airways. “It’s pretty convenient,” said Don Huechteman, a Quincy retiree seeing his wife...