The Bangkok Rapid Transit buses run on proprietary lanes for 15.9 kilometres between Sathorn and Ratchaphruek.
A source from the Bangkok Metropolitan Administration said yesterday that the BMA’s Traffic and Transport Office was studying a battery- or solar-powered tram system and a route extension to the Skytrain.
The BRT buses would be used by city departments for transporting officials or schoolchildren.
Until last month, the Bt2-billion service has catered to 33,741,471 commuters or about 23,000 a day.
The city had to budget Bt200 million a year to subsidise the loss-making operation, the source said.