The SRT Light Red Line, or Nakhon Withi Line (Thai: รถไฟชานเมือง นครวิถี) is part of the SRT Red Lines suburban railway system serving the greater Bangkok Metropolitan Region running for 15 km between Krung Thep Aphiwat Central Terminal and Taling Chan. The completed line will run east–west from Sala Ya in Phutthamonthon District of Nakhon Pathom Province to Hua Mak Railway Station in Bangkok. Full commercial services commenced on 29 November 2021. A 15 km extension of the line from Taling Chan to Salaya has been delayed for tender until June 2022.