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