The Mass Rapid Transit Authority of Thailand (MRTA) is accelerating metro development with ongoing and new projects, enhancing public transport in Bangkok. Construction on the Orange Line (East) from Thailand Cultural Centre to Min Buri is now complete, with 38% of system installation finalized, aiming for an earlier opening in late 2027. Additionally, the Southern Purple Line (Tao Poon–Rat Burana) is 68% complete, targeting operation by 2029 under a public-private partnership model.
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Recently, the Bangkok Metropolitan Administration (BMA) transferred two more lines to the MRTA: the Silver Line and Grey Line. The MRTA is revisiting feasibility studies for these projects, prompted by the Land Traffic Management Commission's (LTMC) directive. These studies, costing 70–80 million baht each and lasting approximately a year, are slated to conclude by 2028.
The proposed Silver Line will span 19.7 km with 14 stations, estimated at 89.9 billion baht. It aims to enhance connectivity between Bang Na and Suvarnabhumi airport via two phases. Meanwhile, the Grey Line Phase 1 will cover 16.3 km with 15 stations, costing 29.1 billion baht, enhancing connectivity from Watcharaphon to Thong Lor. Both lines will be implemented as Light Rail Transit (LRT) systems, prioritizing civil works through government funding before incorporating system works via public-private partnerships.
For existing projects, such as the Brown Line, the MRTA continues to review plans to ensure alignment with other infrastructure developments. In particular, adjustments are being made to integrate with the northern section of Expressway Phase 3, which shares the same right-of-way, reported Bangkok Post.
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Adapted by ASEAN Now · Bangkok Post · 17 Mar 2026