The Mass Rapid Transit Authority of Thailand (MRTA) will ask the cabinet to approve a 230-billion-baht investment for the western extension of the Orange Line this month.
This extended route will stretch from the Thailand Cultural Centre to Bang Khun Non on the outskirts of Thon Buri.
The MRTA expects to have have it up and running by 2026, according to Phakhaphong Sirikantharamat, governor of the MRTA, a state body that oversees Bangkok's trains.
The MRTA is jump-starting a raft of city train projects in the capital and major provinces.
This month it will ask the Ministry of Transport to approve a feasibility study and investment plan for the 100-billion-baht southern extension of the Purple Line which would run between Tao Pun-Rat Burana.
If approved, the agency will ask the new cabinet to give it a final nod later this year.
On public-private investment, the MRTA is negotiating with BSR Joint Venture in a bid to generate more revenue.
This concerns a 7-billion-baht project for an extension of the Pink Line (Sirat-Muang Thong Thani) and another for the Yellow Line (Lat Phrao-Ratchayothin intersection).