[2] The project would relieve congestion along the busy Bang Na - Trat rd corridor and provide an important southern connection to Suvarnabhumi Airport.

On 8 April 2022, the BMA deputy permanent secretary conducted a market sounding seminar to detail the project to potential investors and advised that the report would be submitted to the Interior Ministry for endorsement.

[7] The BMA proposes to gain Cabinet approval for the line in 2023 and conduct a tender in 2024 with a suggested three year construction period commencing in 2025 for a targeted opening date of 2029.

This section starts at the Sunphawut road (in front of MEA Bang Na District, Bang Na District Office, and Phra Khanong Provincial Court), runs along the said road, pass Bang Na intersection, above the outbound Debaratana road's median, pass across Si Iam interchange which connects to MRTA Yellow Line, over the Kingkaew interchange which is a transfer point to Kingkaew-Suvarnabhumi Monorail, and terminate at Thana City.

The line initially appeared on the 1994 Mass Rapid Transit Master Plan (MTMP), before it was further improved in the 1996 CTMP.

It was an extension to the Tanayong SkyTrain until it was canceled when Urban Rail Transportation Master Plan in Bangkok and Surrounding Areas (URMAP) was developed in 2000.

In early September 2021, the BMA Traffic and Transport Department contracted consultants to undertake a six-month feasibility study into the line.

On 8 April 2022, the BMA deputy permanent secretary conducted a market sounding seminar to detail the project to potential investors and advised that the report would be submitted to the Interior Ministry for endorsement.

[15] The BMA stated that the study concluded that the LRT should have a maximum speed of 80 kilometres/hour with a 30-minute trip time with capacity for 15,000 to 30,000 passengers per hour.