Bangkok Expressway and Metro Public Company Limited is a Thailand-based company engaged in construction and operation of the expressway, as well as management and operation of Mass Rapid Transit (MRT) system business. For expressway business, the Company operates expressway networks and provides related services. The Company’s expressway projects include Si Rat expressway, Udon Ratthaya expressway and Si Rat expressway - Bangkok Outer Ring Road. For MRT business, the Company operates train services and MRT stations for the MRT Chaloem Ratchamongkhon line, as well as involves commercial development business. It provides commercial spaces for rental in MRT stations including Khlong Toei, Sukhumvit, Phetchaburi and Phra Ram 9. The Company is also engaged in the provision of parking area and advertising media services. The Company's subsidiaries include Northern Bangkok Expressway Company Limited and Bangkok Metro Networks Limited.