SRT Light Red Line

The 15 km (9.3 mi) section runs from Krung Thep Aphiwat Central Terminal (the new Intercity Terminal in Chatuchak District) to Bang Son where it interchanges with the MRT Purple Line. It then continues west and crosses the Chao Phraya River to the Thonburi side of Bangkok before continuing farther west to Taling Chan where it terminates. Krung Thep Aphiwat Central Terminal Intercity Terminal provides interchange with the SRT Dark Red Line and MRT Blue Line. The line will be extended 14.8 km (9.2 mi) west to Sala Ya in Phutthamonthon District of Nakhon Pathom Province. Finally, the line will be extended south from Krung Thep Aphiwat Central Terminal via Phaya Thai and then east to Hua Mak Railway Station in the east of Bangkok where it will interchange with the MRT Yellow Line.

In 2004, in conjunction with OTP, the SRT began formulating plans for a new, modern suburban network in Bangkok along existing SRT alignments to replace the existing, limited services. On 7 November 2006, the Thai Cabinet passed a resolution to approve the framework of the new network with the SRT Light Red line being DMU operations while the SRT Dark Red Light would be EMU. The Cabinet approved the line on 22 May 2007 with a budget of 13.133 billion baht.[7] At the time, it was expected that the full iine could be completed within 15-20 years. Contracts for construction of the initial section from Taling Chan to Bang Sue were awarded by the SRT on 29 September 2009.[8] The contract was signed on 15 December 2008, with the contract awarded to the Unique-Chun Wo consortium.[9]

Construction

Bang Son Commuter station on SRT Light Red Line

Construction started in early 2010 after some site access delays related to slum dwellers who had been residing various sections of SRT land for many years. Works progressed well but were thereafter delayed for a few months due to the late 2011 floods in Bangkok wth floodwaters inundated on parts of the route. Construction was completed by the 3rd quarter of 2012. Testing began in September 2012 for a 3-month period.[10]

Electrification and 2021 opening

Ticket hall at Bang Son railway station.

The reopening of the SRT Light Red line was contingent upon the completion of the new Krung Thep Aphiwat Central Terminal, delivery of rolling stock and installation of the overhead catenary electrical system between Bang Sue–Taling Chan which was funded as part of the SRT Dark Red Line contract 3 as the SRT had subsequently decided to change the line from DMU to EMU operations. Full electrification was planned to be completed by 2020 when the SRT Dark Red line was completed. By the end of September 2019, Electrical and Signaling installation was at 45.60%.[13]

By June 2020, installation of the catenary system was at 76.82%.[14] The line was expected to reopen in January 2021[13] after test runs began in late October 2020.[15] In mid-November 2020, the Minister of Transport announced that free trial operations would operate from March to May 2021 with full-service operations expected in November 2021.[16] In late February 2021, the SRT confirmed that free trial operations would commence on 26 March 2021 with full commercial operations starting on 28 July 2021.[17] In July, the SRT postponed the service and the free trial operations commenced on 2 August 2021 with full commercial operations due to start on 28 November 2021.[18][1]

A Hitachi-built SRT 1000 series at Bang Son railway station.

The 3rd contract for the SRT Dark Red Line was for the electrical and mechanical (E&M) systems and procuring EMU rolling stock for both the SRT Light Red and SRT Dark Red lines with an overhead catenary electrical system at 25 kV 50 Hz AC. In April 2014, only 2 bidders remained but one of the bidding consortiums was disqualified on due to the fact that one of the consortium members (Marubeni Corporation) had convictions for bribery in an Indonesian bidding process.[19]

This left the MHSC Consortium (consisting of Mitsubishi Heavy Industries, Hitachi, and Sumitomo Corporation) as the sole bidder qualified for the contract. However, their bid of 28,899 billion Baht was above the SRT median price of 26 billion baht which was set in 2010. The MHSC Consortium argued that their bid reflected 2013 prices after the national minimum wage increase from 1 January 2012. Finally in July 2014, after a 2-year delay in the bidding process JICA approved the loan for Contract 3.[20] However, the coup of May 2014 delayed finalization leading to further review and negotiations. By mid-2016, negotiations had concluded and Hitachi promised that all rolling stock for the Dark Red line would be delivered by 2020.[21] The contract specified 25 EMUs consisting of ten 4 car sets and fifteen 6 car sets for 130 cars in total.

In late September 2019, the first 2 sets of rolling stock were shipped from Japan[22] and both arrived in Thailand at Laem Chabang port on 12 October 2019 for shipment to Bangkok.[23] By March 2020, 5 sets had been delivered.[24] As of July 2020, 13 sets - 7 of the 6 car sets and 6 of the 4 car sets - of the ordered 25 sets of rolling stock had been delivered with a further 2 sets due to be delivered by August 2020.[25] By the end of September 2020, 21 sets had been delivered - 13 of the 6 car sets and 8 of the 4 car sets - with the final 4 sets to be delivered in October.[26]

Services operate between 5:30am to 12am. Headways during the trial period are every 30 minutes except for the peak periods (7am to 10am and 5pm to 8pm) where services depart every 20 minutes. Distance-based fares range from 12 to 42 baht. The SRT also offers a 30 day integrated Transit Pass which can be used for 50 trips and for travel on all BMTA buses.

SRT long distance trains on the Southern Line terminating at Krung Thep Aphiwat share the same tracks.

In July 2016, the cabinet approved the construction of the Bang Sue–Phaya Thai–Makkasan–Hua Mak segment.[32] However, the 15 km (9.3 mi), 4 station western extension Taling Chan to Salaya was due to be tendered first by September 2018[33] and then slated for the 2nd half of 2019.[34] However, the tender was further delayed until 2021 as the Transport Minister has requested the new Department of Railways to investigate conducting PPP tenders for this extension.[35] The decision to change the extensions to PPP projects and tender out the operation of the line with a 50 year concession was opposed by the SRT and SRT union. On 10 February 2021, the Department of Railways announced that in April 2021 the SRT would issue the tenders for the west extensions to Salaya and from Taling Chan to Siriraj.[36] However, the PPP tender process was subject to further review.

In October 2021, the SRT announced that the PPP tenders would not be released until June 2022 with the aim to sign contracts for the extensions (with 50 year leases) in July 2023.[5] However, this was delayed yet again to an initial October 2022 tender release[37] and later a December 2022 date.[38] In late October 2022, the SRT again delayed the tender time frame to February 2023 with an aim to sign contracts by May 2023 but the time frame was contingent on new Cabinet approval of an updated budget for the extension.[39] At the same time, the SRT decided to defer the bidding for the 50 year operation concession and new EMUs to December 2024. Once the concession is contracted the SRTET will cease to operate the line.

With the 14 May 2023 national elections and the expected time frame 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 submitted to Cabinet in October 2023 for approval of a new budget of 10.67 billion baht to build the Salaya extension. If approved, a tender could be issued in the first quarter of 2024.[40]

Construction segments based on M-Map:[41]

Wikimedia Commons has media related to SRT Light Red Line.

• "SRT Red Line website"
• Airport Rail Link, BTS, MRT & BRT network map