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2014年9月20日,北京地铁6号线二期(草房站-东小营站)、7号线(北京西站-焦化厂站)、14号线东段(善各庄站-金台路站)、15号线一期西段(望京西站-清华东站)4条新线开始空载试运行。4条新线总里程62.2 km,投入使用车站48座,其中换乘站8座。由于新开通的站点大部分位于城市中心区,对缓解中心城区的拥堵将起到重要作用。4条新线预计于2014年底全部开通,届时,北京城市轨道交通总里程将达到527 km,投入使用车站325
On September 20, 2014, Phase II of Beijing Metro Line 6 (Kushan Station - Dongxiaoying Station), Line 7 (Beijing West Railway Station - Coking Plant Station), east of Line 14 Taiwan Road Station), the first phase of the 15th Phase 1 (Wangjing West Railway Station - Tsinghua Station) four new lines began no-load test run. The total length of the four new lines is 62.2 km, with 48 stations in use, including 8 transfer stations. Since most of the newly opened sites are located in the urban center, congestion in the downtown area will play an important role. The four new lines are expected to be fully operational by the end of 2014. By then, the total urban rail transit mileage in Beijing will reach 527 km and the station in service 325