MTR Corporation Limited operates four business segments: railway operations, Station commercial and rail related businesses, property ownership, management and other businesses, and property developments. Railway operations consist the operation of an urban mass transit railway system within Hong Kong and an Airport Express serving both the Hong Kong International Airport and the AsiaWorld-Expo at Chek Lap Kok, the KCR system consisting of KCR Lines (comprising the East Rail excluding Cross-boundary Service, West Rail and Ma On Shan lines). Station commercial and rail related businesses involves commercial activities, including letting of advertising and retail space, bandwidth services on the railway telecommunication system, railway consultancy services, freight and rail related subsidiaries businesses. Property ownership, management and other businesses consist of property rental, property management and operations relating to Ngong Ping 360.