It was the main rail link from Iowa to South Dakota
                                
                                
                                    (Newser) -
                                    A railroad bridge collapsed during flooding in the Midwest that has forced water rescues, led to evacuations, caused at least one death and brought additional misery during a vast and stubborn heat wave. The bridge connecting North Sioux City, South Dakota, with Sioux City, Iowa, collapsed into the Big Sioux...