The deal includes rolling stock, power distribution equipment, signalling and train control, and telecommunications systems. The fleet of 63 metro cars will be manufactured by Japan Transport Engineering Company (J-Trec), a subsidiary of East Japan Railway Company (JR East).

The Purple Line will run for 23.5km from Bang Yai in Nonthaburi province, northwest of Bangkok, to Bang Sue. The project is being developed by the Mass Rapid Transit Authority of Thailand (MRTA) as a Public Private Partnership funded by Japanese government yen credits. Thai construction company Ch. Karnchang is building the line, which will be operated by Bangkok Metro (BMCL).

Marubeni and Toshiba will maintain the train fleet and electrical systems under a 10-year contract with BMCL. A new company will be set up in Bangkok to provide these services.