The MRT Purple Line officially the MRT Chalong Ratchadham Line opened for service on 6 August 2016 and is the second line operated by MRT and the city’s fifth line.

The Purple Line will serve travellers between the north-western suburbs of Bangkok in Nonthaburi Province and the southern area of Thonburi in Rat Burana District. The line is divided into two sections, – 23 km of elevated section from Tao Poon – Khlong Bang Phai, which came into operation in August of 2016, and the yet to be built 19.8 km underground section from Tao Poon – Rat Burana.

Arcadia and Sem-Logica their UK sister company provided railway expertise as part of the Project Management Consultant Joint Venture for the Bangkok MRTA on this latest 43km line in the rapidly growing Bangkok Urban Rail Systems. Arcadia Sem-Logica supplied expertise in areas of Software and Rail System Assurance to the project management group PCBK.