{{Short description|Mass rapid rail system in Thailand}} {{Use dmy dates|date=May 2026}} {{Infobox public transit | box_width = 300 | name = SRT Red Lines | image = SRTET Logo.svg | alt = | imagesize = 300 | caption = | image2 = SRT Red Line EMU.jpg | alt2 = | imagesize2 = 300 | caption2 = A Light Red Line train at [[Lak Hok (Rangsit University) station]] | image3 = | alt3 = | imagesize3 = | caption3 = | native_name = {{lang|th|รถไฟฟ้าชานเมืองสายสีแดง}} | owner = [[State Railway of Thailand]] | area served = | locale = [[Bangkok Metropolitan Region]] | transit_type = [[Commuter rail]] | lines = {{ubl|{{Rail color box|system=SRT Red Lines|line=Dark Red Line|inline=yes}}|{{Rail color box|system=SRT Red Lines|line=Light Red Line|inline=yes}}}} | line_number = | start = | end = | stations = 58 ''(planned)'' | daily_ridership = | annual_ridership = | chief_executive = <!-- or | key_people = --> | headquarters = | website = | began_operation = {{Start date|2021|08|2|df=y}}<ref>{{Cite web|url=https://mgronline.com/business/detail/9640000075315|title=สายสีแดงเปิดหวูดฝ่าวิกฤต! "ศักดิ์สยาม" ปิดประตูขาดทุน รฟท.งัดทุกกลยุทธ์ปั้นรายได้-เพิ่มผู้โดยสาร|date=2 August 2021}}</ref> | operation_will_start = | ended_operation = | operator = S.R.T. Electrified Train Company Limited | marks = | host = | character = Elevated | stock = [[Hitachi A-train|Hitachi AT100]] | vehicles = 25 EMUs (130 cars); ten 4 car sets and fifteen 6 car sets | train_length = | headway = | system_length = {{convert|41.26|km|mi|2|abbr=on}} ''(operational)''<br />{{convert|98.04|km|mi|2|abbr=on}} ''(planned)''<br />{{convert|139.3|km|mi|2|abbr=on}} ''(total) '' | notrack = 2 | track_gauge = {{Track gauge|metre|allk=on}} | ogauge = <!-- {{Track gauge|sg|allk=on}} --> | minimum_radius_of_curvature = <!-- {{convert|0|ft|0|in|mm|0}} --> | el = {{25 kV 50 Hz}} [[Overhead line|overhead catenary]] | average_speed = {{convert|120|km/h|mph|abbr=on}} | top_speed = {{convert|160|km/h|mph|abbr=on}} | map = | map_name = | map_state = <!-- show or collapsed --> }}

The '''Red Line Mass Transit System Project''' is a [[commuter rail]] system serving the [[Bangkok Metropolitan Region]] in Thailand. The system consists of two lines; the [[Dark Red Line (Bangkok)]], running from [[Thammasat University]]'s [[Rangsit, Thailand|Rangsit]] campus to [[Maha Chai]] in Samut Sakhon Province, and the [[Light Red Line (Bangkok)]], running from [[Salaya, Thailand|Salaya]] in Nakhon Pathom Province to [[Hua Mak Railway Station|Hua Mak]] in Bangkok, with both passing through [[Krung Thep Aphiwat Central Terminal]], which connects to the [[Blue Line (Bangkok)|Blue Line]]. Financed through an aid grant from the [[Japan International Cooperation Agency]] at a cost of {{¥|166.9&nbsp;billion|link=yes}} ({{US$|1.6&nbsp;billion|link=yes}}),<ref>{{Cite web |last=Templeton |first=Dan |date=10 October 2016 |title=Japan finances Bangkok Red Line |url=https://www.railjournal.com/regions/asia/japan-finances-bangkok-red-line/ |access-date=8 January 2025 |website=International Railway Journal}}</ref> construction began in January 2009; free public trial operation began on 2 August 2021, the same day that Krung Thep Aphiwat Central Terminal opened; and full commercial service of the lines began in November 2021.<ref name="bangkokpost">{{cite news|url=https://www.bangkokpost.com/thailand/general/2158775/free-rides-along-red-line-until-november|title=Free rides along Red Line until November|author=bangkokpost|newspaper=Bangkok Post|accessdate=4 August 2021}}</ref> It is part of the [[Mass Rapid Transit Master Plan in Bangkok Metropolitan Region]].

Most of the railway runs alongside existing national railroad tracks, eventually replacing them. Segments running through inner-city areas are elevated, and the system is electrified by [[overhead lines]]. The system was developed and is owned by the [[State Railway of Thailand]].<ref>{{cite web |script-title=th:แผนแม่บทระบบขนส่งมวลชนทางรางในเขตกรุงเทพฯและปริมณฑล พ.ศ.2553-2572 |trans-title=Mass Rapid Transit Master Plan in Bangkok Metropolitan Region |url=http://www.otp.go.th/th/Bkk_mrt/dataupdate/3.pdf|publisher=Office of Transport and Traffic Policy and Planning |access-date=16 January 2012|language=Thai|url-status=dead|archive-url=https://web.archive.org/web/20150715114203/http://www.otp.go.th/th/Bkk_mrt/dataupdate/3.pdf|archive-date=15 July 2015}}</ref><ref>{{cite web |script-title=th:โครงการระบบรถไฟชานเมือง (สายสีแดง) |trans-title=Commuter rail system project (Red Line)|url=http://www.railway.co.th/resultproject/project_redline.asp?redline=1|work=SRT website|publisher=State Railway of Thailand|accessdate=20 January 2012|language=th}}</ref> Since the Red Lines run roughly along the alignment of the failed [[Bangkok Elevated Road and Train System|Hopewell Project]], they have been described as a "Hopewell revival".<ref>"Reviving the former Hopewell route", translated and summarized by Wisarut Bholsithi from Prachachart Thurakij, 4–7 March 2004. "This Northern Commuter has to connect with the Airport Link which is not even at the design stage. At the minimum, the detailed design for the Airport Link must be done by July 2004. The Hopewell revival will be an elevated single floor—either shared tracks or separated tracks for High Speed Rail, DMU/Diesel Tracks, and Red Line Commuter which all have to be done in six years. The elevated section will end at Don Muang and then it will be at grade with separated tracks."</ref>

==See also== * [[Greater Bangkok commuter rail]]

==References== {{reflist}}

==External links== {{Commons category-inline}}

{{Bangkok Rapid Transit stations |LightRed=yes |DarkRed=yes }} {{State Railway of Thailand}} {{Public transport in Bangkok}} {{Urban public transport in Thailand}} {{Urban Rail Transit in ASEAN}}

[[Category:SRT Red Lines| ]] [[Category:25 kV AC railway electrification]]