The Mass Transit Railway system, known locally by the initialism MTR, is a rapid transit system in Hong Kong and the territory's principal mode of railway transportation. Operated by the MTR Corporation (MTRCL), it consists of heavy rail, light rail and feeder bus services, centred around a 10-line rapid transit network, serving the urbanised areas of Hong Kong Island, Kowloon, and the New Territories. The system encompasses 245.3 km (152.4 mi) of railways, as of December 2022, with 179 stations—including 99 heavy rail stations, 68 light rail stops and 1 high-speed rail terminus.
Under the government's rail-led transport policy, the MTR system is a common mode of public transport in Hong Kong, with over five and a half million trips made on an average weekday consistently achieving a 99.9% punctuality rate on its arrivals and departures. As of 2018, the MTR has a 49.3% share of the franchised public transport market, making it the most popular transport option in Hong Kong. The integration of the Octopus card fare-payment technology into the MTR system in September 1997 has further enhanced the ease of commuting.