[5] However, due to COVID-19 outbreaks in Bangkok delaying construction with sites closed, the BSR stated that the first section of the line would not open until July 2022.

[6] On 29 November 2021, daily testing began on a 6 km (3.7 mi) section of the line between the depot at Si Iam and Srinagarindra 38 station.

[6] In mid-April 2022, the Director of EBM/BSR, Mr Surapong Laoha-Unya, stated that further labour & installation delays would mean that the line would now not open until September 2022.

[13] The line stretches from Lat Phrao (YL1) to Samrong (YL23) and the depot is located at Debaratana Road adjacent to Si Iam station (YL17).

In December 2011, the MRTA was instructed by the MOT to divide the Yellow Line into two phases for tender and construction purposes and to reduce land appropriation costs.

Thereafter, a coup in May 2014 resulted in a new military administration and the tender being deferred while a review of all mass transit projects was undertaken for a period of 18 months.

The MRTA was instructed by the junta government to change to a PPP tender process which was subsequently not released until mid-2016.

In early December 2016, The BSR consortium consisting of BTS Group Holdings (75% majority stake) with Sino-Thai Engineering and Construction (STEC), and Ratchaburi Electricity Generation Holding (RATCH), won the bid to construct and operate the Yellow Line.

[17] On June 16, 2017, the contract was signed for the project between the Mass Rapid Transit Authority of Thailand and BSR consortium.

[18] However, this extension is opposed by the MRT Blue Line operator BEM due to concerns regarding loss of revenue.

Passengers are required to change train due to technical difficulties, sections of station runs in different frequency.

[23] The first set arrived in Thailand on 1 October 2020 at Laem Chabang port with a handover ceremony attended by the Thai Prime Minister, BTSC Chairman, MRTA and Canadian Ambassador.

Type •  SRT  (future)•  ARL • SRT Eastern Line A proposed 2-station extension of the route north from the current Ratchada terminus to link to the BTS Sukhumvit Line Extension at Ratchayothin station has also been proposed by the BSR Joint Venture.

[35] However, EBM has repeatedly denied MRTA's request to provide compensation for BEM, which may result in a cancellation of the extension if no decision has been made.

[37] A future extension from Samrong across the Chao Phraya River to link with the MRT Purple Line at Rat Burana was canvassed by the OTP in the early 2010s.

However, the location and design of Samrong station excludes any further extension of the line west of Sukhumvit Road.

This measure aims to address the worsening air pollution caused by surging dust levels across all districts of the capital.

The event followed a similar incident a week earlier on the Pink Line, where a 300-meter section of the on conductor rail fell onto the road near Samakkhi station.