Human error could have been the cause of the collision of two suburban trains outside the southern German city of Munich on Monday. Bavarian Interior Minister Joachim Herrmann told journalists in the state parliament on Tuesday that the investigation was focusing on this question. “As things stand, there are no indications of this, no indications that technical failure is involved.” At the moment, the focus is possibly more on “the possibility that one of the two train drivers … made a mistake.” The two occupied commuter trains collided head-on on a single-track section of the S7 line near E…