BTSC defers Pink, Yellow Line tests published : 1 Jul 2021 at 04:00 The Bangkok Mass Transit System Plc (BTSC) has postponed test-run plans for the Pink and Yellow Line extensions following the temporary closure of construction worker campsites across the city to curb Covid-19 transmissions. Surapong Laoha-unya, CEO of the BTSC, on Wednesdy said construction work on the Pink Line's Khae Rai-Min Buri section and the Yellow Line's Lat Phrao-Samrong section were 70-80% complete. Only minor work, such as electrical system installation and fittings, remained unfinished. Originally, the 30-kilometre Yellow Line was to open by year's end and the 34.5-kilometre Pink Line was expected to be running around March or April next year.