# Grey Line (Bangkok)

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Rail line in Bangkok, Thailand

Grey Line รถไฟฟ้าสายสีเทา Overview Status Feasibility study Owner Mass Rapid Transit Authority of Thailand Locale Bangkok, Thailand Termini Watcharaphon Thong Lo Stations 15 (planned) Service Type Monorail System MRT Services 2 Technical Line length 16.25 kilometers (10.10 mi) (est.) Electrification TBC once the line is designed & later tendered Operating speed 80 km/h (50 mph) TBC

The **Grey Line** is a planned monorail line in the north of [Bangkok](/source/Bangkok) to be built from [Watcharaphon](/source/Vacharaphol_MRT_station) to [Thong Lo](/source/Thong_Lo). The route would provide a vital north - south link for a distance of 16.25 km with 15 planned stations and is expected to cost 27 billion baht.[1] The line would support the growth of residential areas around Pradit Monutham Road and Kaset-Namawin road corridors and is forecast to eventually have 370,000 passengers per day. The BMA Grey will interchange with other lines including the [MRT Pink Line](/source/MRT_Pink_Line), the proposed [MRT Brown Line](/source/MRT_Brown_Line), the [MRT Yellow Line](/source/MRT_Yellow_Line), [MRT Orange Line](/source/MRT_Orange_Line) (under construction) and [BTS Sukhumvit Line](/source/BTS_Sukhumvit_Line).

The BMA contracted a consultants study into the project which was due to be completed by March 2022.[2] A new EIA for the line was completed and approved by the National Environment Board in early March 2022.[3] On 17 March 2022, the BMA held a market sounding seminar with companies interested in potentially bidding for the line and updated that the feasibility study would be completed by early June 2022.[4]

The BMA proposes to gain Cabinet approval for the line in 2023 and identify private investor partners in 2024-2025 with a view to commencing construction in 2026 in order for the line to open in 2030.[5] However, BMA transferred the project to the [Mass Rapid Transit Authority of Thailand](/source/Mass_Rapid_Transit_Authority_of_Thailand) (MRTA) on December 27, 2024, as it is believed that consolidating the project under a single owner will enable better control of fare prices, preventing them from becoming excessively high. After the transfer, the MRTA will reassess the project to determine the feasibility of further construction.

## Route Alignment

The route runs from Ram Indra Road, in the northeast of Bangkok, where it interchanges with the [MRT Pink Line](/source/MRT_Pink_Line) (under construction) running south on Pradit Manuthum Rd along the Chalongrat Expressway corridor. It then interchanges with the proposed [MRT Brown Line](/source/MRT_Brown_Line) at Chalongrat Intersection (Kaset-Namawin rd) and continues further south to interchange with [MRT Yellow Line](/source/MRT_Yellow_Line) at Lat Phrao rd before continuing further south along Pradit Manuthum Rd to interchange with the [MRT Orange Line](/source/MRT_Orange_Line) at Rama 9. Finally, the line continues south then south west into Sukhumvit soi 55 before terminating at the downtown district of [Thong Lo](/source/Thong_Lo) where it interchanges with [BTS Sukhumvit Line](/source/BTS_Sukhumvit_Line).

## History

In August 2011, the newly elected [Yingluck Shinawatra](/source/Yingluck_Shinawatra) government decided to defer plans for the Grey Line and the Light Blue Line, citing that the lines are not a priority within their current 10 lines [Master plan](/source/Mass_Rapid_Transit_Master_Plan_in_Bangkok_Metropolitan_Region). The government suggested the [Bangkok Metropolitan Administration](/source/Bangkok_Metropolitan_Administration) pursue construction but stated that the BMA would have to fully fund the line itself.[6]

The BMA stated in mid 2013 that it considered the line a priority and wanted to progress planning by completing an EIA by the end of 2013 with the aim for the line to be tendered by early 2014.[7] Construction would have then taken place from 2015 - 2017 for a potential opening in 2018.[8] In March 2014, the OTP stated that they would contract a consultant to undertake further study of the line.[9] In May 2014, a consultant was contracted to undertake a financial feasibility study of the line, scheduled to complete the work by the end of 2014.[10] A second public hearing on the proposed line was held in January 2015.[11] An environmental impact assessment was completed in September 2016.[12] However, the EIA did not receive approval from the National Environment Board thus suspending the project.

### Recent planning progress

In June 2018, the Bangkok Metropolitan Administration (BMA) vowed to revive the project by rectifying the EIA and resolve opposition from locals in the Thong Lor area. The BMA also sought to gain approval and support from the Expressway Authority of Thailand (EXAT) to construct the line along the Pradit Monutham rd/Chalongrat Expressway corridor.[13] In September 2018, the MRTA Governor stated that the MRTA would like to build the proposed Grey line in order to provide a feeder line to the [MRT Pink Line](/source/MRT_Pink_Line) and the [MRT Brown Line](/source/MRT_Brown_Line). Also, given that the MRTA was already working with the Expressway Authority of Thailand regarding an integrated design for the MRT Brown line, the MRTA could use that experience to gain access to land needed for the Grey line, especially at the MRT Brown line interchange at Kaset-Namawin rd.[14] However, the BMA refused to transfer the line to the MRTA.

In August 2021, the BMA hired consulting firms to provide analysis for a public-private partnership (PPP) to build the line.[15] The consultants feasibility study was expected to completed by March 2022.[16] However on 17 March 2022, the BMA held a market sounding seminar with companies interested in potentially bidding for the line and updated that the feasibility study would be completed by early June 2022.[17] During the seminar, the BMA also presented engineering and environmental data to the companies.[18] The BMA forecasts 97,000 pax per day when the line is planned to open in 2030 rising to 161,000 pax per day by 2034. After 40 years, the line is forecast to have 370,000 daily pax. A final seminar was held on 27 May 2022. The BMA advised that it would seek approval for the line from the Ministry of Interior in 2–3 months. Reporters in attendance also noted that the newly elected BMA Governor had expressed a preference for the MRTA to handle the project.[19]

## Potential Phase 2 & 3 extensions

Also under consideration is a Phase 2 and Phase 3 extension along the length of Rama 3 rd, over the Chao Phraya river and along Ratchadapisek rd (Inner Ring rd) to Tha Phra to replace the BRT along this route. This would enable the Grey Line to interchange with the [BTS Silom Line](/source/BTS_Silom_Line) at Talat Phlu station, the future [MRT Purple Line](/source/MRT_Purple_Line) (Phase 2) southern extension and link with the [MRT Blue Line](/source/MRT_Blue_Line) extension at Tha Phra station. If the Phase 3 extension is built, the total route distance would be 39.9 km. In September 2019, it was announced that the monorail would be built as two disconnected sections and could be ready by 2023.[20]

A possible Phase 2 extension would extend from [Sukhumvit Rd.](/source/Sukhumvit_Road), along [Rama IV Rd.](/source/Rama_IV_Road), and [Ratchadaphisek](/source/Ratchadaphisek_Road) - Rama 3 Rd and end at The [Rama IX Bridge](/source/Rama_IX_Bridge) at the Chao Praya river and service the Sathupradit area in [Yan Nawa District](/source/Yan_Nawa_District). The Phase 2 extension would result in a route that is approximately 26 km long. It would also essentially replace much of the [Bangkok BRT](/source/Bangkok_BRT) route.

A planned Phase 3 extension from The [Rama IX Bridge](/source/Rama_IX_Bridge) /Rama 3 rd and would continue along Ratchadapisek rd to link with the [BTS Silom Line](/source/BTS_Silom_Line) at Talat Phlu station, the future [MRT Purple Line](/source/MRT_Purple_Line) (Phase 2) southern extension and eventually terminate with the [MRT Blue Line](/source/MRT_Blue_Line) extension at Tha Phra station. A Phase 3 expansion would result in a total distance for the Grey Line of 39.9 km.

## Stations

The route has a total of 15 planned stations. A number of station working names were changed by the Department of Rail Transport in August 2022 to better reflect localities of the stations.[21]

For the potential Phase 2 & 3 sections, 25 stations are proposed. (Note: The [Bangkok BRT](/source/Bangkok_BRT) would be replaced along this section) .

Code Station Name District Transfers Watcharaphon - Thong Lo GY01 Vacharaphol MRT Vacharaphol GY02 Yu Yen GY03 Pradit Manutham 27 MRT (design phase) GY04 Pradit Manutham 25 GY05 Yothin Phatthana GY06 Pradit Manutham 15 GY07 Sangkhom Songkhro GY08 Lat Phrao 71 MRT Lat Phrao 71 GY09 Si Wara GY10 Medical Development Center GY11 Wat Phra Ram 9 MRT (Under construction) Wat Phra Ram 9 GY12 Petchaburi 47 SRT (planned) GY13 Cham Chan GY14 Charoensuk GY15 Thong Lo BTS Thong Lo Potential Phase 2 & 3 South Section (Phra Khanong - Tha Phra) GY16 Phra Khanong BTS Sukhumvit Line: Phra Khanong GY17 Ban Kluai Tai GY18 Kluai Nam Thai GY19 Yaek Kasem Rat GY20 Queen Sirikit National Conventional Centre MRT Blue Line: Queen Sirikit National Conventional Centre GY21 Khlong Toei MRT Blue Line: Khlong Toei GY22 Ngam Du Phli GY23 Lumphini MRT Blue Line: Lumphini GY24 Suan Phlu GY25 Chong Nonsi BTS Silom Line: Chong Nonsi GY26 Thungmahamek GY27 Rajamangala University of Technology Krungthep GY28 Nang Linchi GY29 Ratchada-Narathiwat GY30 Yannawa GY31 Phra Ram 3 GY32 Khlong Phum GY33 Khlong Dan GY34 Sathupradit GY35 Rama IX Bridge GY36 Charoenrat GY37 Bang Ko Laem GY38 Mahaisawan MRT Purple Line: Samre (Under construction) GY39 Talat Phlu BTS Silom Line: Talat Phlu GY40 Tha Phra MRT Blue Line: Tha Phra

## Network Map

## See also

- [Mass Rapid Transit Master Plan in Bangkok Metropolitan Region](/source/Mass_Rapid_Transit_Master_Plan_in_Bangkok_Metropolitan_Region)

- [MRT (Bangkok)](/source/MRT_(Bangkok))

- [MRT Blue Line](/source/MRT_Blue_Line)

- [MRT Brown Line](/source/MRT_Brown_Line)

- [MRT Light Blue Line](/source/MRT_Light_Blue_Line)

- [MRT Orange Line](/source/MRT_Orange_Line)

- [MRT Pink Line](/source/MRT_Pink_Line)

- [MRT Purple Line](/source/MRT_Purple_Line)

- [MRT Yellow Line](/source/MRT_Yellow_Line)

- [BTS Skytrain](/source/BTS_Skytrain)

- [BTS Sukhumvit Line](/source/BTS_Sukhumvit_Line)

- [BTS Silom Line](/source/BTS_Silom_Line)

- [Airport Rail Link (Bangkok)](/source/Airport_Rail_Link_(Bangkok))

- [SRT Light Red Line](/source/SRT_Light_Red_Line)

- [SRT Dark Red Line](/source/SRT_Dark_Red_Line)

- [Bangkok BRT](/source/Bangkok_BRT)

- [BMA Gold Line](/source/Gold_Line_(Bangkok))

- [BMA Bang Na-Suvarnabhumi Line](/source/Bang_Na-Suvarnabhumi_light_rail)

## References

1. **[^](#cite_ref-1)** ["Plans for new grey line gather steam"](https://www.bangkokpost.com/business/2214599/plans-for-new-grey-line-gather-steam). *Bangkok Post*. 13 November 2021.

1. **[^](#cite_ref-2)** Wancharoen, Supoj (9 August 2021). ["City Hall hires consultants to oversee new monorail"](https://www.bangkokpost.com/business/2162131/city-hall-hires-consultants-to-oversee-new-monorail). *Bangkok Post*.

1. **[^](#cite_ref-3)** ["กทม. - สัมมนาหาผู้ลงทุน'โมโนเรล'สีเทา"](https://www.khaosod.co.th/newspaper/newspaper-inside-pages/news_6919457). *Khaosod News*. 3 March 2022.

1. **[^](#cite_ref-4)** ["พ.ค.นี้ ปิดจ๊อบผลศึกษา PPP รถไฟฟ้าสีเทา "วัชรพล-ทองหล่อ" 2.7 หมื่นล้าน"](https://www.dailynews.co.th/news/865815/). *Dailynews*. 17 March 2022.

1. **[^](#cite_ref-5)** ["ดินเครื่อง! ลุยศึกษา PPP รถไฟฟ้าสีเทา "วัชรพล-ทองหล่อ" 2.7 หมื่นล้าน"](https://www.dailynews.co.th/news/468774/). *Dailynews*. 12 November 2021.

1. **[^](#cite_ref-M-Map_6-0)** ["เพื่อไทยรื้อแผนปชป. ตัดทิ้งรถไฟฟ้าสองสาย เส้นวัชรพล-พระราม 9 และดินแดง-สาธร"](http://www.prachachat.net/news_detail.php?newsid=1314757223&grpid=00&catid=&subcatid=).

1. **[^](#cite_ref-7)** [http://www.dailynews.co.th/bkk/21223](http://www.dailynews.co.th/bkk/21223)., กทม.เข็นโมโนเรลสายแรก "วัชรพล-ลาดพร้าว"Daily News, 15 June 2013

1. **[^](#cite_ref-8)** ["Archived copy"](https://www.dailynews.co.th/Content/bangkok/195462/%E0%B8%AD%E0%B8%B5%E0%B8%813%E0%B8%9B%E0%B8%B5%E0%B8%95%E0%B8%AD%E0%B8%81%E0%B9%80%E0%B8%AA%E0%B8%B2%E0%B9%80%E0%B8%82%E0%B9%87%E0%B8%A1%E0%B9%82%E0%B8%A1%E0%B9%82%E0%B8%99%E0%B9%80%E0%B8%A3%E0%B8%A5/). 18 November 2013. [Archived](https://web.archive.org/web/20131217043146/https://www.dailynews.co.th/Content/bangkok/195462/%E0%B8%AD%E0%B8%B5%E0%B8%813%E0%B8%9B%E0%B8%B5%E0%B8%95%E0%B8%AD%E0%B8%81%E0%B9%80%E0%B8%AA%E0%B8%B2%E0%B9%80%E0%B8%82%E0%B9%87%E0%B8%A1%E0%B9%82%E0%B8%A1%E0%B9%82%E0%B8%99%E0%B9%80%E0%B8%A3%E0%B8%A5/) from the original on 17 December 2013. Retrieved 29 August 2021.{{[cite news](https://en.wikipedia.org/wiki/Template:Cite_news)}}: CS1 maint: archived copy as title ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_archived_copy_as_title))

1. **[^](#cite_ref-9)** [http://www.thanonline.com/index.php?option=com_content&view=article&id=224171:2014-03-25-05-25-41&catid=129:2009-02-08-11-47-38&Itemid=479#.U8l7I_mSwnV](http://www.thanonline.com/index.php?option=com_content&view=article&id=224171:2014-03-25-05-25-41&catid=129:2009-02-08-11-47-38&Itemid=479#.U8l7I_mSwnV) 25 March 2014

1. **[^](#cite_ref-10)** ["เร่งทำโมโนเรลวัชรพล-พระราม9"](https://web.archive.org/web/20140530113523/http://its.in.th/index.php/component/content/article/1-latest-news/12672---9). *its.in.th*. Archived from [the original](http://its.in.th/index.php/component/content/article/1-latest-news/12672---9) on 2014-05-30.

1. **[^](#cite_ref-11)** ["BMA holds public hearing on Grey Line monorail project"](http://thainews.prd.go.th/website_en/news/news_detail/WNPOL5801200010007). *thainews.prd.go.th*. Retrieved 2016-10-30.

1. **[^](#cite_ref-12)** ["EIA for 'Grey Line' monorail completed"](https://www.bangkokpost.com/thailand/general/1094740/eia-for-'grey-line-monorail-completed). *Bangkok Post*. 28 September 2016.

1. **[^](#cite_ref-13)** ["City Hall seeks to revive grey line project"](https://www.bangkokpost.com/news/transport/1485316/city-hall-seeks-to-revive-grey-line-project). *Bangkok Post*. 15 June 2018.

1. **[^](#cite_ref-14)** ["รฟม.เปิดแผนสร้างรถไฟฟ้าโมโนเรลสายสีเทา 'วัชรพล-ท่าพระ' แก้ปัญหารถติด"](https://www.thaipost.net/main/detail/18015). *Thai Post*. 20 September 2018.

1. **[^](#cite_ref-15)** Wancharoen, Supoj (9 August 2021). ["City Hall hires consultants to oversee new monorail"](https://www.bangkokpost.com/business/2162131/city-hall-hires-consultants-to-oversee-new-monorail). *Bangkok Post*.

1. **[^](#cite_ref-16)** ["Plans for new grey line gather steam"](https://www.bangkokpost.com/business/2214599/plans-for-new-grey-line-gather-steam). *Bangkok Post*. 13 November 2021.

1. **[^](#cite_ref-17)** ["พ.ค.นี้ ปิดจ๊อบผลศึกษา PPP รถไฟฟ้าสีเทา "วัชรพล-ทองหล่อ" 2.7 หมื่นล้าน"](https://www.dailynews.co.th/news/865815/). *Dailynews*. 17 March 2022.

1. **[^](#cite_ref-18)** Wancharoen, Supoj (18 March 2022). ["BMA starts courting Grey Line investors"](https://www.bangkokpost.com/thailand/general/2280962/bma-starts-courting-grey-line-investors). *Bangkok Post*.

1. **[^](#cite_ref-19)** ["กทม.เดินหน้าสายสีเทา 2.7 หมื่นล้านสัมปทาน30ปี"](https://www.facebook.com/TransportDailynews/posts/561293742114531). *Daily News*. 26 May 2022.

1. **[^](#cite_ref-20)** ["Bangkok transit map to feature new Grey Line"](https://www.bangkokpost.com/business/1761279/bangkok-transit-map-to-feature-new-grey-line). *Bangkok Post*. 30 September 2019.

1. **[^](#cite_ref-21)** ["Department of Rail Transport meeting with BMA on Grey line update"](https://www.facebook.com/DRT.OfficialFanpage/posts/358201859837616). *DRT Facebook page*. 2 August 2022.

v t e Bangkok Metropolitan Mass Rapid Transit stations

v t e Public transport systems in Bangkok Metropolitan Region Transport in Bangkok List of rapid transit stations in Bangkok Rail transport in Bangkok Mass Rapid Transit Master Plan in Bangkok Metropolitan Region Railways Inter-city rail and High-speed rail Open State Railway of Thailand Northern Line Northeastern Line Southern Line Eastern Line Maeklong Railway Under construction Eastern HSR (2029) Northeastern HSR (2026) Planned Northern HSR Southern HSR Commuter rail SRT SRT ARL State Railway of Thailand Lopburi Kaeng Khoi Prachinburi Ratchaburi Suphan Buri Rapid transit BTS BTS MRT MRT MRT (under construction, 2028) Monorail MRT MRT MRT (planned) MRL (planned) MRL (planned) People mover BTS Suvarnabhumi APM Don Mueang APM (planned) Light rail and Tram BTS (planned) Trams in Bangkok (defunct) Main stations Krung Thep Aphiwat (Bang Sue) Bangkok (Hua Lamphong) Makkasan Roads Expressways Chaloem Maha Nakhon Si Rat Chalong Rat Burapha Withi Udon Ratthaya Prachim Ratthaya Uttaraphimuk S1 Kanchanaphisek Rama III–Dao Khanong–Western Outer Ring Road (under construction, 2025) Motorways Open () () Under construction (2025) (2025) (2025) Planned National highways () () () () Buses Operators and Routes Bangkok BRT BMTA Thai Smile Bus Bus Line 8 (Bangkok) Terminals Ekkamai Bus Terminal Mo Chit 2 Bus Terminal Old Mo Chit Bus Terminal New Southern Bus Terminal Water transport River Chao Phraya Express Boat OrangeFlag YellowFlag Thai Smile Boat Canals Khlong Saen Saep boat service Khlong Phadung Krung Kasem boat service Khlong Phasi Charoen boat service

v t e Urban rail transit in Southeast Asia Annual Riderships by cities 1 billion or more Singapore 500 million – 999 million Bangkok 100 million – 499 million Jakarta Kuala Lumpur Metro Manila 50 million – 99 million — 10 million – 49 million Hanoi Ho Chi Minh City Bandung Surabaya Yogyakarta (Surakarta) 5 million – 9.9 million Seberang Perai (Ipoh) 1 million – 4.9 million Palembang Cilegon (Serang) Medan Johor Bahru Yangon Padang Indonesia Java Greater Jakarta Integrated Mass Transit System Greater Jakarta Commuter Jakarta MRT M2 2B Jakarta LRT 3 Jabodebek LRT Bogor Grogol Senayan SHIA Skytrain SHIA ARS Merak Commuter Whoosh HSR KCJB Feeder KCJB Greater Bandung Commuter Bandung Walahar Garut Yogyakarta-Solo Commuter Adisumarmo ARS YIA ARS Surakarta Railbus Greater Semarang Commuter Greater Surabaya Commuter Sumatra Aceh Commuter Palembang LRT Kualanamu ARS A Greater Medan Commuter Minangkabau Express Padang Commuter Medan LRT Batang Kuis Lau Cih Cemara Lesser Sunda Islands Bali Urban Subway Cemagi Nusa Dua Sanur Ubud Laos Boten–Vientiane railway Malaysia Peninsular Malaysia Klang Valley Integrated Transit System 1 2 3 4 5 6 7 8 9 10 11 12 13 KLIA Aerotrain KTM ETS KTM Intercity RTS ECR KTM Komuter Northern Sector 1 2 KTM Komuter Southern Sector 1 2 Penang LRT MTL TTL Penang Hill Railway Johor Bahru ART TBL SKL IPL East Malaysia Kota Kinabalu LRT Monorail Kuching ART SM SR DM Myanmar Yangon Circular Railway Mandalay Circular Railway Yangon Urban Mass Rapid Transit Philippines Luzon Greater Capital Region Railway System Manila LRT Line 1 Line 2 Line 6 Manila MRT Line 3 Line 4 Line 5 (cancelled) Line 7 Line 8 Line 9 Line 10 Line 11 Philippine National Railways Metro Commuter NSCR NECL North Main Line South Main Line SkyTrain Visayas Cebu Monorail Cebu Urban Mass Rapid Transit Mindanao Davao People Mover Singapore Singapore MRT NSL EWL NEL CCL DTL TEL JRL CRL Singapore LRT BPLRT SKLRT PGLRT Changi Airport Skytrain Sentosa Express KTM Shuttle Tebrau RTS Thailand Bangkok Metropolitan Mass Rapid Transit Master Plan BTS Silom Sukhumvit Gold MRT Blue Purple Yellow Pink Orange Brown Grey Light Blue Silver Asia Era One ARL Red Lines Light Red Dark Red APM Suvarnabhumi Don Mueang Utapao HSR Eastern Northeastern Northern Southern Provincial Chiang Mai LRT Hat Yai Monorail Khon Kaen LRT Nakhon Ratchasima LRT Pattaya Monorail Phitsanulok Tram Phuket Island LRT Vietnam Hanoi Metro Line 2A Line 3 Ho Chi Minh City Metro 1 Line 1 North-South HSR Note: Under construction & planned lines are in Italics

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Adapted from the Wikipedia article [Grey Line (Bangkok)](https://en.wikipedia.org/wiki/Grey_Line_(Bangkok)) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Grey_Line_(Bangkok)?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.