Shanghai subway chases after end to undertaking in view of investigation, detail had be notted announce adequately, about Shanghai subway 10 lines pursue the direct matter of end accident, the outside still is put guess. Because the supplier of fault signal system blocks Si Ke company, be pointed to with " 7 · 23 " the supplier of system of signal of lukewarm line of the another name for Ningbo in the accident " the department goes out with the door " , the outside guesses go up in signal equipment centrally above all. Also many personage inside course of study points out, the accident is attemper artificially in normal instead happen after run mode, suspicion is to attemper error be caused by. South the reporter understands, the signal equipment of Ka Sike company is applied extensively in route of many subway of domestic, 6 lines mix the Guangzhou subway that includes to be about to debut among them the Shenzhen subway in operation 5 lines. Guess blemish of 1 equipment? The signal equipment of Ka Sike