Orange Line (Bangkok)

The MRT Orange Line (Thai: รถไฟฟ้ามหานคร สายสีส้ม) is a rapid transit line of the Mass Rapid Transit Authority of Thailand (MRTA) in the Bangkok Metropolitan Area, Thailand. When fully completed, the MRT Orange line will be 35.9 km (22.3 mi) long with 29 stations (7 stations will be elevated for 8.9 km (5.5 mi) and 22 will be underground for 27 km (16.8 mi)), including an interchange with the current Thailand Cultural Centre Station of MRT Blue Line).

MRT Orange Line
รถไฟฟ้ามหานคร สายสีส้ม
Min Buri Station
Overview
StatusUnder Construction (Eastern Section)
Tendered (Western Extension)
OwnerMass Rapid Transit Authority of Thailand
LocaleBangkok, Thailand
Termini
Stations29
17 (Under construction)
12 (tender awarded)
Service
TypeRapid transit
SystemMRT
Operator(s)Bangkok Expressway and Metro
History
Planned openingLate 2025 (Eastern section)
Est. 2028 (Western section)
Technical
Line length35.86 km (22.28 mi)
Track length22.57 km (14.02 mi) (under construction)
Track gauge1,435 mm (4 ft 8+12 in) standard gauge
Electrification750 V DC third rail
Operating speed80 km/h (50 mph)
Route map

Bang Khun Non
 MRT 
Siriraj
Sanam Luang
Democracy Monument
 MRT 
Lan Luang
Yommarat
 SRT 
Ratchathewi
 BTS 
Pratunam
Ratchaprarop
 ARL 
Din Daeng
Pracha Songkhro
 MRL 
Thailand Cultural Centre
 MRT 
MRTA
Wat Phraram Kao
Ramkhamhaeng 12
 MRL 
Ramkhamhaeng University
SAT
Ramkhamhaeng 40
Yaek Lam Sali
 MRT 
Si Burapha
Ban Ma
Sammakorn
Nom Klao
Rat Phatthana
Wat Bang Pheng
Kheha Ram
Min Buri
 MRT 
Yaek Rom Klao

The line is divided into two sections; the 22.5 km (14.0 mi) Eastern section from Yeak Rom Klao to Thailand Cultural Centre and the 2nd phase, 13.4 km (8.3 mi) Western section from Thailand Cultural Centre to Bang Khun Non. Construction of the 22.5 km (14.0 mi) Eastern Section started in June 2017.

The line cannot open until a signalling system is installed and rolling stock is ordered, both of which have not been tendered as the processes have been delayed due to problems with the western extension tender process. The line is not expected to open until August 2025 or more likely late 2025 or early 2026.

By the end of April 2023, construction had progressed to 99.50%.

Western extension tender delay and litigation

On 3 July 2020, the MRTA released the tender for the design and construction of the Western extension. However in late August 2020, the tender submission deadline was subsequently delayed. and the MRTA amended the tender assessment criteria resulting in a lawsuit and an injunction suspending the tender decision. The tender was subsequently cancelled by the MRTA in February 2021 given ongoing litigation by the BTSC. After approval by the Administrative Court given ongoing litigation, a new tender issued in October has a deadline for bids of January 2022.

The Criminal Court - Corruption and Malfeasance Division hearing into the cancelled tender process was conducted in late December 2021 which further delayed the reissued tender timeframe. Subject to court approval, the MRTA planned to review tender bids for a period of 3 months before seeking Cabinet approval for a reissued tender in April or May 2022. The MRTA reissued the new tender on 24 May 2022 with tender packages available for purchase until 10 June. 14 different companies purchased the auction envelopes.

The 141 billion baht western extension consists of 86 billion baht for civil works, 14 billion for land appropriation and 31 billion for systems installation, rolling stock and maintenance. The winning bidder was announced by the MRTA on 9 September 2022 with BEM winning the right to build and run the extension over the ITD consortium. However, continued litigation by the BTSC into 2023 has delayed the start of construction.

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