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Which security company does the fourth operation company of Shanghai Metro outsource security inspection to?

Shanghai Railway Security Company. According to Baidu.com, the fourth operation company of Shanghai Metro is all outsourced (except the stationmaster), and the security inspectors are also outsourced to Shanghai Rail Security Company. Shanghai Rail Security Company is Party B: outsourced to Kunming, Kunshan Boli and Qiandongnan security companies.