BANGKOK - Sep 21: The Bangkok Mass Transit System (BTS) at a city centre station Sep 21, 2014 in Bangkok Thailand. The Thai capital's BTS rail public transport system serves 600,000 passengers daily Shutterstock Image - BANGKOK - Sep 21: The Bangkok Mass Transit System (BTS) at a city centre station Sep 21, 2014 in Bangkok Thailand. The Thai capital's BTS rail public transport system serves 600,000 passengers daily - ID: 319720835