The MRT Brown line investment plan was approved by the MRTA Board in June 2019 for final detailed design,[1] which was expected to be completed by December 2020.

[3] On 18 May 2023, the MRTA Board meet to approve the updated designs & analysis and draft tender documents for the line.

The line then turns south along Nawamin Road over Lam Phang Phuai lake and past Klong Chan Stadium.

[5] However, the Pheu Thai candidate did not win the election and the Gold Line proposal was dropped with the then Deputy Minister of Transport stating that land appropriation costs were too high.

[8] Subsequently, the route was finalised by OTP and public hearings into the project were held during 2017 as the government proposed integrating the design with a new expressway.

In August 2013, the MRTA approved the MRT Brown line in principle to complete the design by 2016 with an expected 3-year construction period for a 2021 opening.

[11] The feasibility study was undertaken during the same period where design for the N2 expressway (which runs along Kaset-Namawin rd) was being finalised by EXAT without catering for the MRT Brown Line.

[12] OTP and MOT subsequently proposed an integrated design and construction of the Brown Line jointly with the N2 expressway which was approved by Cabinet.

[15] In early June 2019, the MRTA Board approved the investment plan for the Brown Line and integrated design with the N2 Expressway conducted by EXAT.