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This page presents a list of the longest continuous underground rapid transit tunnel sections of the world, excluding branches from the longest tunnel (branch lines that used to transport passengers should be included).
Note: This article only lists tunnels that are 15 km (6.2 miles) or longer.
| Name | System | Country | Stations | Length | Expected completion |
|---|---|---|---|---|---|
| Ligne 15 | Paris Métro |  France | Circle route, all underground | 75 km (47 mi) | 2025–2030 |
| M11 | Istanbul Metro |  Turkey | (Phase 2, Kargo Terminali - Halkalı section is 31.5 km in length and is currently under construction, all underground) | 69 km (43 mi) | Phase 2：2024 |
| Cross Island line | Mass Rapid Transit (Singapore) |  Singapore | Linear route with branch section, all underground (Excludes potential extension from Punggol to Seletar Airport under planning) | 65.5 km (40.7 mi) | 2030–2032 |
| Line 13 | Guangzhou Metro |  China | Whole lines is underground (includes Phase II: Chaoyang – Zhucun is 33.6 km and under construction) | 59.2 km (36.8 mi) | Phase 1：2017 Phase 2：2024 and later |
| L9 / L10 | Barcelona Metro |  Spain | 47.8 km (29.7 mi) (incl. branches) | 2009 and 2016 partially; central section: 2028-2029 | |
| Line 13 | Shenzhen Metro | China | Whole line is underground | 45.72 km (28.41 mi) | Phase 1：2024 Phase 2 (North extension)：2025 South extension：2026 |
| Thomson–East Coast line | Mass Rapid Transit (Singapore) | Singapore | Woodlands North to Sungei Bedok (Phases 4 and 5, Gardens by the Bay – Sungei Bedok are 13 km in length and are currently under construction, all underground) | 43.4 km (27.0 mi) | Phase 4：2024 Phase 5：2025 |
| Line 11 | Guangzhou Metro | China | Circle route, all underground | 43.2 km (26.8 mi) | 2024 |
| Troitskaya line | Moscow Metro |  Russia | Whole line is underground | 40.2 km (25.0 mi) | Phase 1：2024 (25 km (16 mi)) Phase 2：2028–2029 (15.2 km (9.4 mi)) |
| Athens Metro Line 4 | Athens Metro |  | 38.2 km (23.7 mi) [16] | 2029 for Phase 1 [17] | |
| Metro Manila Subway | Manila Metro Rail Transit System |  Philippines | Mindanao Avenue – Ninoy Aquino International Airport (All underground) | 36 km (22 mi) | 2029 |
| Line 3 | Mumbai Metro |  India | Cuffe Parade-SEEPZ | 33.02 km (20.52 mi) | 2024 for Phase 1 |
| Line 13 | Chengdu Metro | China | Qiligou – Longhua Temple underground section | 29.07 km (18.06 mi) | 2024 |
| Line 3 | Chennai Metro | India | Madhavaram Milk Colony – Tharamani | 27.086 km (16.830 mi) | 2026–2027 |
| D Line Extension | Los Angeles Metro |  United States | Westwood/VA Hospital – Union Station | 24.3 km (15.1 mi) | 2025–2026 |
| Line 30 | Chengdu Metro | China | (Phase 1 is 26.28 km) | 26.28 km (16.33 mi) | 2024 |
| Suburban Rail Loop | Melbourne rail network |  Australia | SRL East and North is underground (Cheltenham to Airport) | 26 km (16 mi) | 2035 [18] (Eastern stretch) |
| Metro West | Sydney Metro | Australia | 24 km (15 mi) | 2032 [19] | |
| Metro Western Sydney Airport | Sydney Metro | Australia | 23 km (14 mi) | 2026 | |
| Blue Line | Stockholm Metro |  Sweden | The extension to Nacka will be around 8 km, all underground, total 22 km including older sections. | 22 km (14 mi) | 2030 |
| Line 27 | Chengdu Metro | China | Whole line is 24.86 km, but only 17.34 km underground | 17.34 km (10.77 mi) | 2024 |
| Metro City & Southwest | Sydney Metro | Australia | Chatswood – Sydenham | 16 km (9.9 mi) | 2024 [20] |
The Hangzhou Metro is a rapid transit system that serves Hangzhou in Zhejiang province, China. The system opened on November 24, 2012. It is the 17th city in China to operate a rapid transit system.
The Chengdu Metro is the rapid transit system of Chengdu, the capital of Sichuan, China. With the opening of Line 1 on 27 September 2010, the system consists of 13 subway lines and 1 light rail line. It has subsequently undergone rapid expansion. Since the opening of Lines 6, 8, 9, and 17 on 18 December 2020, the Chengdu Metro is the 4th longest metro system in the world.
Urban rail transit in China encompasses a broad range of urban and suburban electric passenger rail mass transit systems including subway, light rail, tram and maglev. Some classifications also include non-rail bus rapid transport. As of 31 December 2023, China has the world's longest urban rail transit system with more than 10,000 km (6,200 mi) of urban rail nationwide in 49 systems in 47 cities, accounting for 9 of the 10 longest metro systems, with the exceptions of the Moscow Metro or metro systems in Seoul combined if metro systems in the same cities are merged in the rank.
The Guangfo Metro or Guangfo line is a intercity metro line that connects the Chinese cities of Foshan and Guangzhou. As of December 2018, the line is currently 39.6 km (24.61 mi) long and has 25 stations, which are all underground.
Line 3 of the Guangzhou Metro is a 65.43-kilometer (40.66 mi) rapid transit line connects Panyu Square to Tianhe Coach Terminal. The entire line, including all track and stations, is located in tunnels. Its 57.93 km (36.00 mi) main branch, excluding the 7.5 km (4.66 mi) branch between Tianhe Coach Terminal and Tiyu Xilu, is now the third longest continuous subway tunnel in the world, and the longest rail tunnel of any kind.
The Harbin Metro is the rapid transit system of Harbin, the provincial capital of Heilongjiang Province in northeastern China.́ The system began operation on 26 September 2013 with the opening of Line 1. The system has a total of three lines as of November 2021.
Line 8 of the Guangzhou Metro is a north-west L-shaped line on the system that runs from Jiaoxin to Wanshengwei, spanning a total of 33.9 km (21.06 mi) with 28 stations. It interchanges with Line 1 at Chen Clan Academy, Line 2 at Changgang, Line 3 at Kecun, Line 4 at Wanshengwei and Line 6 at Cultural Park. All stations on Line 8 are underground. Line 8's color is teal.
Line 7 of the Guangzhou Metro is a rapid transit line in Guangzhou and Foshan, Guangdong Province, China. It is envisioned as tangential line that runs across southeast Guangzhou and Foshan, allowing for orbital traffic between the suburbs of Shunde, Panyu and Huangpu to avoid the crowded stations in the city center. Line 7's color is ■ light green.
Line 6 of the Chengdu Metro is a rapid transit line in Chengdu. It starts at Wangcong Temple and ends at Lanjiagou. The total length is 68.223 km (42.4 mi) with 56 stations.
Line 3 of the Hangzhou Metro is a metro line in Hangzhou. The line is 57.5 km long. It will run in a southwest-northeast direction between Wushanqiancun station in Yuhang District and Xingqiao station in Linping District in the east, passing through downtown Hangzhou and providing transfers with multiple other lines in the system. The line uses 6-car Type AH rolling stock, which is designed for exclusive use in Hangzhou.
Line 19 of the Hangzhou Metro is a rapid transit line in Hangzhou. The line was opened on 22 September 2022.
Line 18 of the Guangzhou Metro is a rapid transit express line in Guangzhou with trains operating up to 160 km/h (99 mph). It will run in a south-north direction, connecting Wanqingsha in Nansha District, Panyu Square in Panyu District, Modiesha in Haizhu District, Zhujiang New Town and Guangzhou East Railway Station in Tianhe District. The line commenced service on 28 September 2021.
Line 22 of the Guangzhou Metro is a partially open rapid transit express line in Guangzhou with trains operating up to 160 km/h (99 mph). It runs between Panyu Square and Chentougang, passing Guangzhou South Railway Station in Panyu District, and will eventually run in a north-south direction passing Xilang and Fangcun in Liwan District. Currently, there are train attendants on board each train. In the future, trains will operate fully driverless GoA4 mode when sufficient reliability from the signaling system has been confirmed.
Line 17 of the Chengdu Metro is a metro line in Chengdu. The whole line will be 30.286 km when Phase 2 opens. The line uses 8-car Type-A trains operating up to 140 km/h speed powered by 25kV AC overhead lines.
Wanqingsha Station is a station on Line 18 of the Guangzhou Metro, located underneath Nansha railway station in Guangzhou's Nansha District. It opened on 28 September 2021, and is the current southern terminus of the line.
Xiancun Station is a station on Line 18 of the Guangzhou Metro, located underground at the fork of Huangpu Avenue West, Tiyu East Road and Xiancun Road in Guangzhou's Tianhe District. It opened on 28 September 2021, and is the current northern terminus of the line.
Longtan Station is a station on Line 18 of the Guangzhou Metro, located underground between Xinjiao Middle Road and Taichong in Guangzhou's Haizhu District. It opened on 28 September 2021.
Shaxi Station is a station on Line 18 of the Guangzhou Metro, located underground northwest of the intersection of Panyu Bridge and Shaxi Avenue on Shajiao Island in Guangzhou's Panyu District. It opened on 28 September 2021.
Hengli Station is a station on Line 18 of the Guangzhou Metro, located underground at the west side of Fenghuang Dadao on Hengli Island in Guangzhou's Nansha District. It opened on 28 September 2021.
成都地铁6号线全长68.76千米，共设有56座车站
广州市2021年十件民生实事显示，2021年广州将力争开通试运营地铁18号线先通段（万顷沙-冼村，58.3公里）、22号线先通段（番禺广场-陈头岗，18.2公里）
