A company on the fast track, MTR operates Hong Kong's commuter railway system. The company's network was expanded significantly in 2007 through a combination with the rail operations of Kowloon-Canton Railway. Overall, MTR operates about 210 km of track in Hong Kong, Kowloon, the New Territories, and mainland China, plus a light rail network in the New Territories, an airport express line, and bus feeder services. Although railway operations make up the bulk of its business, MTR also manages residential and commercial properties near its stations. Through its Octopus Cards subsidiary, the company provides smart card technology for fare collection. The Hong Kong government owns a controlling stake in MTR.