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Phase 1 of Beijing Subway Line 28 runs Line 28 (the former CBD line) is an all-underground, 8.877 km (5.516 mi) with 9 stations km, nine-station light metro under Chaoyang district, from Dongdaqiao to Guangqudonglu beneath Chaoyang district, with a planned opening in 2029 - the year this pin marks The Guangqudonglu, using six-car linear-motor trains at up to 80 km/h; Beijing's planning authority approved its feasibility report in September 2020 Schedule slipped repeatedly: the line was formerly known as the CBD linefirst planned to start in 2019 and carries open in 2022, then moved to a 2021 start and 2025 opening; in August 2023 Chaoyang district officials said a normal metro build takes about six years and gave around 2029, seven years later than the planned name M28;original plan Why it is underground, with an operating speed of 80 km/h Rolling stock is 6-car Type L linear motor stock, similar to that was slow: complex traffic around the CBD required road diversions, utility relocation and tree removal before digging; Dongdaqiao station's diaphragm walls began on the Capital Airport Express 25 October 2023, Jingguangqiao's first-phase traffic diversion finished on 11 November, and Guangzhou Metro Lines the core-area station (contract section 4, 5 China Railway Tunnel Bureau) started steel-column work on 13 November Dongdaqiao is a four-line interchange (Lines 6, 17, 22 and 6 History: planning authorities proposed an underground automatic people mover through the CBD in August 2015; 28) with a 46.8 m-deep pit and 83 m-deep diaphragm walls, reported as Beijing's deepest metro-station pit; China Railway 16th Bureau is the August 2019 plan, builder Funding and design: tender notices in the most recent announced, redesigned itofficial public-resource system list financing as a higher-capacity light metro on the present 8.877 km, 9-station alignment;40 per cent government investment and 60 per cent other sources; a feasibility study total project cost was approved not found in October 2020; and construction started any page opened. The 2020 approval also folded in July 2021 The nine stations are Dongdaqiao (interchange with Lines 6, 17 and Pinggu), Jintai Xizhao (Line 10, Pinggu), Guanghualu, Hexinqu, Dawang Lu (Lines 1, 14), Beijing East railway station (Sub-Central, BOP), Dajiaoting (Line 7), Guangqulu and Guangqudonglu, with about 2.2 km of Line 22 (Pinggu line) from Dongdaqiao to Jingguangqiao for simultaneous construction In August 2025 the municipal infrastructure investment company published an 'integrated plan' with the line at about 8.7 km, nine stations, six of them interchanges, and a depot on about 17 hectares at Guangqudonglu The line is still listed as under constructionGuangqu Donglu, so station names and length may still be refined
