Since the typical timeframe for rail projects, from conception to completion phase, would take eight or nine years, the Railway Development Study recommended that the Hong Kong (SAR) Government should commence as soon as possible, so that the new express railway could be constructed in time to meet capacity demands. At the same time, the report recommended that Hung Hom station should continue to play a central role in Hong Kong's mass transit. The RER could be further extended to Hong Kong Island. The Study went further on the British proposal of connecting Hong Kong and China from Kowloon. The Hong Kong (SAR) Government commissioned a second Railway Development Study in March 1998. This Regional Express Railway (RER) proposal was developed in the 1994 “Railway Development Study” (RDS) it foresaw a continual growth of Hong Kong's population over the next two decades and strong demand for cross-border passenger traffic. A high-speed railway connecting Guangzhou, Shenzhen and Hong Kong, railway was brought up in the late 1990s by the Government of Hong Kong. After the establishment of the People's Republic of China, three railway lines from the mainland, also known as “santang kuaiche” (three cargo express trains), were arranged to transport fresh food every day to maintain the daily needs of the Hong Kong people. The railway connecting the mainland China has been important for Hong Kong since the 20th century. Hong Kong (West Kowloon) – Guangzhou South: 47 minutes (fastest).Hong Kong (West Kowloon) – Shenzhen North: 19 minutes (fastest).Hong Kong (West Kowloon) – Futian: 14 minutes.It opened for public on Sunday 23 September 2018. The final phase, which connects Shenzhen-Futian to Hong Kong (West Kowloon) was inaugurated on 22 September 2018. Services were extended to the city centre of Shenzhen at Futian in December 2015. The first phase, Shenzhen North– Guangzhou South, commenced revenue operation in December 2011. Three types of rolling stock that operate along the XRL: Hexie (Harmony) and Fuxing (Rejuvenation) operated by China Railway, and Vibrant Express by MTR Corporation.

Guangzhou–Shenzhen–Hong Kong Express Rail Link ( XRL), also known as “Guangshengang XRL” (officially Beijing–Guangzhou–Shenzhen–Hong Kong high-speed railway, Guangzhou–Shenzhen–Hong Kong section), is a high-speed railway line that connects Beijing and Hong Kong ( Kowloon) via Guangzhou and Shenzhen.

Sz mtr map