Since the former Kowloon–Canton Railway (KCR) merged with the MTR subway system in 2007, all trains now run under the MTR name. The ultra-efficient train network connects Kowloon to the eastern and western New Territories. Trains run every 5–8 minutes, and connections to the subway are relatively quick. This is a commuter service and, like the subway, has sparkling-clean trains and stations—smoking and eating are forbidden in both.
The train network has three main lines. The East Rail line begins at Hung Hom, with notable stops at Mong Kok, Kowloon Tong, Sha Tin, Racecourse, Chinese University, and Tai Po on its way to Lo Wu at the mainland Chinese border. East Rail is the fastest way to get to Shenzhen—it's a 40-minute trip from Hung Hom to Lo Wu. The Hung Hom train station terminus connects via a series of walkways with East Tsim Sha Tsui; you can also transfer to the subway at Kowloon Tong.
The short Ma On Shan Rail service starts at Tai Wai and has eight stops in the northeastern New Territories.
West Rail starts at East Tsim Sha Tsui, moves on to Tsim Sha Tsui for a possible connection to the subway, then extends westward through 10 more stops to Tuen Mun, in the New Territories. Here West Rail connects with the local Light Rail Transit, an above-ground train serving mainly residential and industrial areas in the western New Territories.
Fares range from HK$3.10 to HK$42.50; you can pay by Octopus Card or buy tickets from sales counters or ticket machines.