合和實業
The 80 billion baht (US$3.2 billion) project was approved on 9 November 1990, without a feasibility study or clear timeline for completion, as a joint project of the Thai Ministry of Transport, the State Railway of Thailand (SRT), and the Thai subsidiary of Hopewell Holdings of Hong Kong. There were to be three phases: the first a north-south line from Hua Lamphong Railway Station, Bangkok's main train station, to Don Mueang International Airport; the second an east-west line from Taling Chan District to Hua Mak; and the third a spur to the port. Totaling 60 km, all three were to be built on top of existing SRT train lines.