Just two months after a bullet-train crash killed 35 people near Wenzhou, a massive subway pileup near Shanghai has injured 270 people, 20 of them critically, and spooked Chinese riders again. In Tuesday’s crash, two underground trains collided because of a signal failure. State media blamed the incident on a signal malfunction that forced staff to direct train traffic via telephone. “Today is the darkest day in the history of the Shanghai Metro’s operation,” read a report by the local Internet company Sina.
