Bangkok Expressway and Metro Public Company Limited, together with its subsidiaries, engages in the construction and management of expressways and rail mass rapid transit system projects in Thailand. The company operates through Expressway Business, Rail Business, and Commercial Development Business segments. It is involved in the operation of metro services, including commercial development relating to the expressway and metro systems. The company also operates and manages the Si Rat Expressway, the Si Rat - Outer Ring Road Expressway, and the Udon Ratthaya Expressway, as well as the M.R.T. Chaloem Ratchamongkhon Line and MRT Chalong Ratchadham Line projects. In addition, it engages in the leasing of retail space, and provision of advertising services, as well as offers service and maintenance telecommunication systems equipment inside metro stations. The company was founded in 1998 and is headquartered in Bangkok, Thailand.