Events
January
Turkey January 2– Line M7 of the Istanbul Metro extends from Mecidiyeköy to Yıldız. [1] - Turkey January 6– Line M8 of the Istanbul Metro opens between Bostancı and Parseller. [2]
United States January 7– Line T Third Street of the San Francisco Muni Metro rerouted via the Central Subway to Chinatown station. [3] - January 18
China – Beijing Subway introduces through service between Line 9 and the Fangshan Line. [4] - China – Chongqing Rail Transit: Line 9 extends from Xingke Ave to Huashigou and Line 10 extends from Liyuchi to Houbao. [5]
India January 19– Mumbai Metro: Line 2 extends from Dahanukarwadi to Andheri West and Line 7 extends from Aarey to Gundavali. [6] - Turkey January 22– Line M11 of the Istanbul Metro opens between Kağıthane and Kargo Terminali. [7]
Mauritius January 23– Metro Express: Service extends from Port Louis Victoria to Place d'Armes and Rèduit branch opens. [8] - United States January 25– MTA Long Island Rail Road opens shuttle service between Jamaica and Grand Central Madison via the East Side Access. [9]
February
- China February 4– Changping Line of the Beijing Subway extends from Qinghe railway station to Xitucheng. [10]
Iran February 8– Line 2 of the Shiraz Metro opens between Qahramanan and Imam Hossein. [11] 
Taiwan February 10– Ankeng light rail of the New Taipei Metro opens between Shuangcheng and Shisizhang. [12] 
Algeria February 18– Mostaganem tramway : Line 1 opens between La Salamandre and Karouba and Line 2 opens between Gare de Mostaganem SNTF and Nouvelle Gare Routière. [13] - February 27
- China – Line 5 of Chongqing Rail Transit extends from The Expo Garden Center to Yuegangbeilu. [14]
- Iran – Line 2 of the Karaj Metro opens between Golshahr 45-metre and Ayatollah Taleghani. [15]
- United States – MTA Long Island Rail Road begins full service to Grand Central Madison via the East Side Access. [16]
March
Russia March 1– Bolshaya Koltsevaya Line of the Moscow Metro extends from Kashirskaya to Nizhegorodskaya and from Elektrozavodskaya to Savyolovskaya. [17] - March 10
United Kingdom – Luton DART opens between Luton Airport and Luton Airport Parkway. [18] - United States – R211A cars enter passenger service on the A line of the MTA New York City Subway. [19]
- March 16
Malaysia – MRT Putrajaya Line extends from Kampung Batu to Putrajaya Sentral. [20] 
Panama – Line 2 of the Panama Metro extends via a branch from Corredor Sur to Aeropuerto. [21]
- China March 17 – Line 5 of the Dalian Metro opens between Hutan Xinqu and Houguan. [22]
- March 18
- Iran – Tehran Metro: Line 6 extends from Tarbiat Modares University to Imam Hossein and Line 7 extends from Meydan-e San'at to Shahid Dadman. [23]
Japan – Eastern Kanagawa Rail Link: Tōkyū Shin-yokohama Line opens between Shin-yokohama and Hiyoshi and Sōtetsu Shin-yokohama Line extends from Hazawa yokohama-kokudai to Shin-yokohama. [24] - Japan – Umeda Freight Line switches to a new underground alignment to serve an expanded Ōsaka Station. [25]
- India March 26 – Purple Line of the Namma Metro extends via a disconnected branch from Krishnarajapura to Whitefield (Kadugodi). [26]
- March 27
- Japan – Nanakuma Line of the Fukuoka City Subway extends from Tenjin-Minami to Hakata. [27]
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– Málaga Metro: Line 1 extends from El Perchel to Atarazanas and Line 2 extends from El Perchel to Guadalmedina. [28]
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March 31 – Line B of the Rotterdam Metro extends from Hoek van Holland Haven to Hoek van Holland Strand. [29]
April
- Japan April 1– Rumoi Main Line closes between Ishikari-Numata and Rumoi. [30]
- China April 7– Jinyidong Line of the Jinhua Rail Transit extends from Sports Center to Ming & Qing Dynasty Palaces. [31]
- Turkey April 8– Line M3 of the Istanbul Metro extends from Başakşehir MetroKent to Kayaşehir Merkez. [32]
- April 11– Vitoria-Gasteiz tram network extends from Florida to Salburua. [33]
- Turkey April 12– Line M4 of the Ankara Metro extends from Atatürk Kültür Merkezi to Kızılay. [34]
- China
April 13– Cross-border passenger service begins between Kunming and Vientiane via the Kunming-Yuxi, Yuxi-Mohan, and Boten-Vientiane rail corridors. [35] 
Canada 
April 14– Canadian Pacific and Kansas City Southern merge to form CPKC. [36] - Turkey April 20– Akçaray tram extends from Plajyolu to Kuruçeşme. [37]
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April 25– Circle Line of the Tashkent Metro extends from Qoʻyliq to Kuruvchilar. [38] - Turkey April 26– Ankara–Sivas high speed railway opens for commercial operation. [39]
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April 29 – Line A of the Bordeaux tram network extends via a branch from Quatre Chemins to Aéroport de Bordeaux-Mérignac. [40]
May
- Iran May 1 – Line 4 of the Tehran Metro extends from Eram-e Sabz to Allameh Ja'fari. [41]
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May 2 – Line 1 of the Quito Metro opens for partial commercial operation between El Labrador and Quitumbe. [42] - China May 9 – Changsha Dawangshan SkyShuttle opens between Shantang and Guanyingang. [43]
- May 11 – Line 1 of the Quito Metro ends service a week after opening. [44]
- United Kingdom May 28 – TransPennine Trains takes over the TransPennine franchise from TransPennine Express. [45]
June
- June 1
- China – TEDA Modern Guided Rail Tram ends service. [46]
- China – Zhangjiang Tram ends service. [47]
- China June 6 – Line 4 of the Changchun Rail Transit extends from Tiangong Road to Tianxin Road. [48]
- United Kingdom June 7– Edinburgh Trams extends from St Andrew Square, Edinburgh to Newhaven. [49]
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June 11 – Commercial service opens between Montreux and Interlaken Ost. [50] - United States June 16– Los Angeles Metro Rail: A Line extends from 7th Street/Metro Center to APU/Citrus College via the Regional Connector, E Line extends from 7th Street/Metro Center to Atlantic via the Regional Connector, and L Line ends service. [51]
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June 19– MRT Yellow Line opens between Lat Phrao and Samrong. [52] - June 24
- China – Line 11 of the Suzhou Rail Transit opens between Weiting and Huaqiao. [53]
- – Line 10 of the Île-de-France tram network opens between La Croix de Berny and Jardin Parisien. [54]
- China June 27– Xi'an Metro: Line 2 extends from Xi'an Beizhan to Caotan and from Weiqunan to Changninggong and Line 16 opens between Qinchuangyuanzhongxin and Shijingli. [55]
- June 28
- China – Xihuan Line, a southern extension of Line 3 of the Changsha Metro, opens between Shantang and Xiangtan North railway station. [56]
- China – Line S4 of the Nanjing Metro opens between Chahe and Chuzhou Railway Station. [57]
- China June 29– Line 2 of the Lanzhou Metro opens between Yanbai Bridge and Dongfanghong Square. [58]
- United States June 30– Skyline opens in Oahu between Kualakaʻi and Hālawa. [59]
July
- July 1
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– Seohae Line of the Seoul Metropolitan Subway extends from Sosa to Daegok. [60] - China – Line 1 of the Hefei Metro extends from Hefei Railway Station to Zhangwa. [61]
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July 4– Line 4 of the Milan Metro extends from Dateo to San Babila. [62] - July 8– Angers tramway: Line B opens between Belle-Beille Campus and Monplaisir and Line C opens between Belle-Beille Campus and Angers Roseraie. [63]
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July 20– LRTA 13000 class cars enter passenger service on Line 1 of the Manila Light Rail Transit System. [64] - Canada July 24– Line 3 Scarborough of the Toronto Subway ends service. [65]
- China July 26– Line 2 of the Shaoxing Metro opens from Jinghu Hospital to Tandu. [66]
- July 31
- Canada – First phase of the Réseau express métropolitain opens in Greater Montreal between Brossard and Central Station. [67]
- Taiwan – Airport MRT Line of the Taoyuan Metro extends from Huanbei to Laojie River. [68]
August
- India August 1– Pune Metro: Purple Line extends from Phugewadi to Civil Court and Aqua Line extends from Garware College to Ruby Hall Clinic. [69]
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August 7– Line 3 of the Tampere light rail network extends from Pyynikintori to Santalahti. [70] - Russia August 17– Line D3 of the Moscow Central Diameters opens from Zelenograd-Kryukovo to Ippodrom. [71]
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August 18 – Red Line of the Tel Aviv Light Rail opens between HaKomemiyut and Kiryat Arye and between HaKomemiyut and Petah Tikva. [72] - August 26
- China – Line S2 of Wenzhou Rail Transit opens between Dongshan and Qingdong Road. [73]
- Japan – Utsunomiya Light Rail opens between Utsunomiya Station East and Haga Takanezawa Industrial Park. [74]
- China August 27 – Fuzhou Metro: Line 4 opens between Fenghuangchi and Difengjiang and Line 5 extends from Ancient Luozhou Town and Fuzhou South Railway Station. [75]
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August 28– Jabodebek LRT: Cibubur Line opens between Harjamukti and Dukuh Atas and Bekasi Line opens between Jatimulya and Dukuh Atas. [76] - Turkey August 30– Line T5 of the Istanbul Tram extends from Cibali to Eminönü. [77]
September
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September 4– Blue Line of the Lagos Rail Mass Transit opens for limited commercial operation between Mile 2 and Marina. [78] - Russia September 6– Solntsevskaya Line of the Moscow Metro extends from Rasskazovka to Aeroport Vnukovo. [79]
- Russia September 7– Lyublinsko-Dmitrovskaya Line of the Moscow Metro extends from Seligerskaya to Fiztekh. [80]
- China September 8– Line 3 of the Zhengzhou Metro extends between Yinggang and Binhe Xincheng Nan. [81]
- Russia September 9– Line D4 of the Moscow Central Diameters opens from Zheleznodorozhnaya to Aprelevka. [82]
- September 15 – El Insurgente commuter rail opens from Zinacantepec to Lerma. [83]
- United States September 16– T Line of the Link light rail system extends from Theater District to St. Joseph. [84]
- September 17
- – Airport Express Line of the Delhi Metro extends from Dwarka Sector 21 to Yashobhoomi Dwarka Sector 25. [85]
- United Kingdom – Line 1 of the West Midlands Metro extends from The Royal to Wolverhampton. [86]
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- September 18– Line Z and Line K of the Tren Interoceánico resume freight service. [87]
- China September 21– Line 1 of the Xi'an Metro extends from Fenghesenlingongyuan to Xianyangxizhan. [88]
- United States September 22– Brightline extends from West Palm Beach to Orlando International Airport. [89]
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September 25– Line 3 of the Santiago Metro extends from Los Libertadores to Plaza de Quilicura. [90] - September 26
- China – Guangzhou–Shanwei high-speed railway opens. [91]
- China – Optics Valley Sky Rail opens between Jiufengshan and Longquanshan. [92]
- September 28
- China – Fuzhou–Xiamen high-speed railway opens. [93]
- China – Shanghai–Nanjing Riverside high-speed railway opens. [94]
- China – Line 10 of the Zhengzhou Metro opens between Zhengzhou railway station and Zhengzhou West railway station. [95]
- September 29
- China – Line 3 of the Harbin Metro extends from Taipingqiao to Chinese-baroque Block. [96]
- China – Shenyang Metro: Line 2 extends from Quanyunlu to Taoxianjichang and Line 4 opens between Zhengxinlu and Chuangxinlu. [97]
October
- October 2– Jakarta–Bandung high-speed railway opens. [98]
- United Kingdom October 4 – West Midlands to Manchester section of the High Speed 2 railway cancelled. [99]
- United Kingdom October 5 – Northern Line of Merseyrail extends from Kirkby to Headbolt Lane. [100]
- India October 9– Purple Line of the Namma Metro extends from Kengeri to Challaghatta and connects Krishnarajapuram with Baiyappanahalli. [101]
- Iran October 10– Tehran Metro: Line 6 extends from Shahid Sattari to Koushar and Line 7 extends from Shahid Dadman to Meydan-e Katab. [102]
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October 13– Lines 4 and 5 of the Prague tram network extend from Holyně to Slivenec. [103] - October 20– Line B of the Lyon Metro extends from Gare d'Oullins to Saint-Genis-Laval Hôpitaux Sud. [104]
- October 21
- – Jokeri light rail opens between Itäkeskus and Keilaniemi. [105]
- India – Delhi–Meerut Regional Rapid Transit System opens initial section between Sahibabad and Duhai. [106]
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- China October 26– Line 13 of the Qingdao Metro extends from Jinggangshan Road to Jialingjiang West Road. [107]
- Turkey October 28– Line T4 of the Kayseray opens between Cumhuriyet Meydanı and İzzet Bayraktar Cami. [108]
- October 29
- – Boughezoul–Laghouat railway opens. [109]
- – L-Line of Milwaukee's The Hop opens for limited commercial operation between Wisconsin Ave and Lakefront. [110]
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November
- Canada November 4– Valley Line of Edmonton LRT opens between 102 Street and Mill Woods. [111]
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November 5– Line 6 of the Dhaka Metro Rail extends from Agargaon to Motijheel. [112] - November 10– Eastern Line of Thai Railways extends to Sattahip port with two new stations U Taphao and Chuk Samet. [113] [114]
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November 15– Line M2 of the Bucharest Metro extends from Berceni to Tudor Arghezi. [115] - India November 17– Line 1 of the Navi Mumbai Metro opens from CBD Belapur to Pendhar. [116]
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November 20– Transperth's Armadale and Thornlie lines close for the Victoria Park-Canning Level Crossing Removal Project. [117] - November 21– MRT Pink Line opens for limited commercial operation between Nonthaburi Civic Center and Min Buri. [118]
- November 27– Line 2 of the Santiago Metro extends from La Cisterna to Hospital El Pino. [119]
- China November 28– Line 19 of the Chengdu Metro extends from Jiujiang North to Tianfu Station. [120]
- November 30
- China – Chongqing Rail Transit: Line 5 connects Dashiba with Shiqiaopu and Line 10 extends from Houbao to Lanhualu. [121]
- Iran – Line 1 of the Tehran Metro extends via the Imam Khomeini Airport Branch from Forudgahi-e Imam Khomeini to Shahr-e Parand. [122]
December
- December 1
- China – Line 5 of the Wuhan Metro extends from Hubei University of Chinese Medicine to Hongxia. [123]
- – Line 1 of the Quito Metro opens between El Labrador and Quitumbe. [124]
- December 4– Line V of Transilien opens between Massy-Palaiseau and Versailles-Chantiers to replace newly discontinued RER C service. [125]
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December 8– Taipa Line of the Macau Light Rapid Transit extends from Ocean to Barra. [126] - December 9– RER C ends service between Savigny-sur-Orge and Massy-Palaiseau. [127]
- December 10
- – Line T12 of the Île-de-France tramway network opens between Évry-Courcouronnes to Massy-Palaiseau. [128]
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– Line 13 of the Hannover Stadtbahn opens between Wallensteinstraße and Hemmingen. [129] - – Line 15 of the Geneva tramway network extends from Palettes to ZIPLO. [130]
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- December 15– Tren Maya opens between Cancún and San Francisco de Campeche. [131]
- December 16
- China – Line 3 of the Guiyang Metro opens between Luowan and Tongmuling. [132]
- – Line 1 of the Seoul Metropolitan Subway extends from Soyosan to Yeoncheon. [133]
- December 17– Line 16 of the Mannheim/Ludwigshafen tramway network opens between Bensheimer and Sullivan. [134]
- December 20
- China – Line 12 of the Zhengzhou Metro opens between Longzihu Dong and Lianghu. [135]
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– Dnipro City Express opens between Dnipro and Kamianske. [136]
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December 21– Line 2 of the Lima Metro opens between Evitamiento and Mercado Santa Anita. [137] - December 22
- – Line Z of the Tren Interoceánico opens for commercial operation between Salina Cruz and Coatzacoalcos. [138]
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– Line 25 of the Silesian Interurbans extends from Dąb Huta Baildon to Katowice Dąbrowki. [139]
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- China December 23– Suzhou Rail Transit introduces through service between Line 3 and Line 11. [140]
- December 26
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– Line 1 of the Salvador Metro extends from Campinas to Águas Claras. [141] - China – Line 3 of the Harbin Metro extends from Chinese-baroque Block to Beima Road. [142]
- China – Hefei Metro: Line 2 extends from Sanshibu to Cuozhen and Line 3 extends from Xingfuba to Sheng Ertong Yiyuan Xinqu. [143]
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- December 27
- China – Line 2 of Nantong Rail Transit opens between Xingfu and Xianfeng. [144]
- China – Line 8 of the Shenzhen Metro extends from Yantian Road to Xiaomeisha. [145]
- – PNR South Main Line reopens between Naga and Legazpi. [146]
- December 28
- China – Line 18 of Chongqing Rail Transit opens between Fuhualu and Tiaodengnan. [147]
- China – Guangzhou Metro: Line 5 extends from Wenchong to Huangpu New Port and Line 7 extends from Higher Education Mega Center South to Yanshan. [148]
- China – Line 7 of the Nanjing Metro extends via a disconnected branch from Yingtiandajie to Xishanqiao. [149]
- China – Line 11 of the Tianjin Metro opens between Dongjiangdao and Dongliliujinglu. [150]
- China – Zhengxu Line of the Zhengzhou Metro opens between Chang'anlubei and Xuchangdong Railway Station. [151]
- December 30
- China – Beijing Subway: Line 11 extends from Jin'anqiao to Moshikou, Line 16 extends from Yushuzhuang to Wanpingcheng, and Line 17 extends via a disconnected branch from Future Science City North to Workers' Stadium. [152]
- China – Line 19 of the Wuhan Metro opens between West Square of Wuhan Railway Station and Xinyuexi Park. [153]
- – Line 4 of the Olsztyn tramway network opens between Dworzec Głowny and Pieczewo. [154]
- December 31– Tren Maya extends from San Francisco de Campeche to Palenque. [155]
