The extension route connecting the Bang Sue station of the underground train and Taopoon station of the Purple Line from Bang Sue to Bang Yai is expected to become operational in August.
Mr Chirut Visarnchit, spokesman of Transport Ministry said that the construction of the extension route was in progress with 74.77 percent of the works already completed.
These include: signaling system, 73.76 percent completed; communication system, 55.31 percent completed; power supply system, automatic fare collection system, 100 percent completed.
The test of the systems will be conducted in June.
Mr Chirut said that, meanwhile, the Metropolitan Rapid Transit Authority which operates the Blue Line would train staff to be prepared for the opening of the extension route.
Trial running is expected to be conducted in July until August.
Source: Thai Public Broadcasting Service (Thai PBS)