The Guangzhou–Kowloon through train (simplified Chinese: 广九直通车 or 港穗直通车; traditional Chinese: 廣九直通車 or 港穗直通車; pinyin: Guǎngjiǔ Zhítōngchē or Găngsuì Zhítōngchē) was an inter-city railway service between Hong Kong and Guangzhou jointly operated by the MTR Corporation of Hong Kong and the Guangzhou Railway Group of mainland China.

At first trains on the British Section ran northwards from a temporary terminus at Kowloon Point[clarification needed] through the eastern New Territories up to the border with China at Lo Wu.

After the establishment of the People's Republic of China in 1949, through-trains were initially unable to cross the border, a situation that persisted for thirty years.

On 4 April 1979, the through train service between Canton (Guangzhou) and Hung Hom resumed after agreement between Hong Kong and Chinese authorities.

[6][7] On 31 July 2024, the General Administration of Customs announced the closure of all remaining four railway ports for the inter-city through trains, which was already approved by the State Council in June 2024, marking the official discontinuation of the service.

The cited reason for the discontinuation was that the high-speed passenger trains have effectively met the travel needs between the mainland and Hong Kong.

During this period, the through train service included new stops, such as in Tin Ho (天河), Wan Luk (雲麓), Sheung Shui (上水).