SRT Dark Red Line

The SRT Dark Red Line (also referred to as Thani Ratthaya Line (Thai: รถไฟชานเมือง สายธานีรัถยา)), is part of the SRT Red Line suburban railway system to serve the greater Bangkok Metropolitan Region running for 26 km (16 mi) between Krung Thep Aphiwat and Rangsit.

SRT Dark Red Line
SRT Dark Red Line train at the Rangsit railway station
Overview
Other name(s)Thani Ratthaya Line
Native nameสายธานีรัถยา
StatusOperational (Phase 1)
OwnerState Railway of Thailand
LocaleBangkok Metropolitan Region
Termini
Stations10
Service
TypeCommuter rail
SystemSRT Red Lines
Operator(s)SRTET - SRT Electrified Train Company Limited
Depot(s)Chatuchak, Bangkok
Rolling stockHitachi AT100
History
Opened2 August 2021 (2021-08-02) (free trial service)
29 November 2021 (2021-11-29) (commercial service)
Technical
Line length26 km (16 mi)
Number of tracks2
CharacterElevated
Track gauge1,000 mm (3 ft 3+38 in) metre gauge
Electrification25 kV 50 Hz AC overhead catenary
Operating speed160 km/h (99 mph)
SignallingThales AlTrac for ERTMS (ECTS Level 1)
Route map

km
SRT Northern & Northeastern Lines
Future North Extension
32.6
Thammasat University
29.9
Chiang Rak
Bangkok University
26.2
Khlong Nueng
22.6
Rangsit
19.9
Lak Hok (Rangsit University)
13.8
Don Mueang
11.8
Kan Kheha
(  MRT  Pink Line )
9.9
Lak Si
7.1
Thung Song Hong
5.6
Bang Khen
4.1
Wat Samian Nari
2.6
Chatuchak
 SRT  to Talingchan
SRT Southern Line
Bang Sue Junction
0.0
Krung Thep Aphiwat Central Terminal
 MRT  Blue Line
Pradiphat
2.7
Sam Sen
3.7
Ratchawithi
Ramathibodi Hospital Halt
 ARL  To Suvarnabhumi
 SRT  to Hua Mak
Yommarat Halt
SRT Eastern Line
5.4
Yommarat
Urupong Halt
6.5
Yotse
7.5
Hua Lamphong
Bangkok railway station
 MRT  Blue Line
Future South Extension
Khlong San  BTS 
 BTS  Silom Line
 MRT  Purple Line
Wongwian Yai
SRT Maeklong Railway
Talat Phlu
 BTS  Silom Line
Wutthakat
Taksin
Khlong Ton Sai
Chom Thong
Wat Sai
Wat Singh
Bang Bon
Khan Keha
Rang Sakae
Rang Pho
Sam Yaek
Phrom Daen
Thung Si Thong
Bang Nam Chuet
Khok Khwai
Ban Khom
Khlong Chak
Maha Chai

In mid-November 2020, the Minister of Transport announced that free trial operations would operate from March 2021 with full-service operations expected from November 2021. In late February 2021, the SRT confirmed that free trial operations will commence on 26 March 2021 with full commercial operations starting on 28 July 2021. However, in July 2021 the SRT again postponed the free trial operations until 2 August 2021.

The line finally opened for trial operations on 2 August 2021. Full commercial services began on 29 November 2021.

A much delayed 8.84 km (5.49 mi) extension of the line from Rangsit to Thammasat University was due to be tendered in June 2022. However, this was later delayed to December 2022 and then until February 2023. With the 14 May 2023 national elections and the ongoing delays in the formation of a new government, it is unlikely that the tenders will be issued until late 2023. In late June, a MOT source expressed that the extension is likely be taken to Cabinet for approval in October 2023 and if approved, a tender could be issued in the first quarter of 2024.

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