BEM has been granted concessions for mass rapid transit system projects from the Mass Rapid Transit Authority of Thailand (“MRTA”), namely, MRT Blue Line comprises of M.R.T Chaloem Ratchamongkhon Line Project. Being one of Bangkok’s heavy mass rapid transit, the M.R.T. Chaloem Ratchamongkhon Line has become the first metro in Thailand because its initial system section of Hua Lamphong to Bang Sue that has 18 stations along the over 20 kilometers distance.

On August 9th, 1999, H.M. King Bhumibol Adulyadej graciously bestowed the name “The M.R.T. Chaloem Ratchamongkhon” which means “Celebration of the Auspicious Kingship” on this Thailand’s first underground line, H.M. King Bhumibol Adulyadej and Queen Sirikit presided over the official inauguration ceremony on the 3rd July, 2004.

The M.R.T Chalong Ratchadham Line Project (MRT Purple Line), Bang Yai – Bang Sue Section, is an elevated railway system throughout the route, for a distance of approximately 23 kilometers, totaling 16 stations, starting from Khlong Bang Phai Station, where depot is located, to Tao Poon Station serving as the interchange station between the MRT Purple Line and the MRT Blue Line.

The MRT Chalong Ratchadham Line Project (MRT Purple Line), Bang Yai - Tao Poon Section, was graciously given its name by His Majesty King Bhumibol Adulyadej, King Rama IX, on the occasion of the 70th Anniversary Celebrations of His Majesty King Bhumibol Adulyadej’s Accession to the Throne. The name “Chalong Ratchadham” has signified that “To Celebrate the Great King’s Reign with Righteousness”. On August 6, 2016, Her Royal Highness the Princess Maha Chakri Sirindhorn graciously presided over the official opening ceremony of the project.