According to the feasibility study on economics and environment and the preliminary design of the Yellow Line project which was undertaken by Office of Transport and Traffic Policy and Planning (OTP) during the years 2007-2011, the Yellow Line project was divided into 2 sections, i.e. Ratchada/Lat Phrao-Phatthanakan section and Phatthanakan-Samrong section, or The Yellow Line(Lat Phrao - Samrong). The MRT Yellow line has officially opened for revenue service since July 3rd 2023.