2011年7月23日20点34分,北京南至福州D301次列车与杭州至福州南D3115次列车在浙江温州段发生特大追尾脱轨事故。截至本刊发稿日,共造成39人遇难,192人受伤,其中重症12人。我们希望通过图解的方式,全面解读动车在安全控制方面的技术种类和层次。令人遗憾的是,种种技术、个个系统、层层控制、级级监控依然没有避免事故的发生…… At 20:34 on July 23, 2011, the D301 train from Beijing south to Fuzhou and the D3115 train from Hangzhou to Fuzhou south occurred an extraordinarily rear-end collision accident in Wenzhou, Zhejiang Province. As of press issue date, a total of 39 people were killed and 192 were injured, of which 12 were critically ill. We hope that by way of illustration, we can comprehensively understand the technical types and levels of EMU’s safety control. Regrettably, all kinds of technologies, individual systems, layers of control, and class-level monitoring still do not avoid accidents.