Trains from mainland China to Hong Kong are operated by the Mass Transit Railway Corporation (MTR) (tel: +852 2947 7888; www.it3.mtr.com.hk). Among its services is a route from Guangzhou (2 hours away) several times a day, stopping at Dongguan (Changping) on the way to Kowloon in Hong Kong. There is also a daily service from Foshan and Zhaoqing to Hong Kong. In Kowloon, trains terminate at Hung Hom Station in Tsim Sha Tsui East.
Services between Shanghai and Kowloon (journey time - 19 hours) and Beijing and Kowloon (journey time - 24 hours) run on alternate days. Note that mainland Chinese know Kowloon as Jiulong, and this will be on destination boards.
Local East Rail Line trains run regularly to Kowloon from Lo Wu, the last stop before the Chinese border. Just across the border is Shenzhen, a special economic zone in China. To go as far as Lo Wu from Kowloon, you must hold a visa for China, otherwise it is only possible to get to Sheung Shui.