A second-class ticket to Shenzhen costs $US11 (HK$86), while travelling to Beijing $US160.
"They have concerns and negative outlook about the market [under the] trade war and rise in interest rate in the USA, which slows down Hong Kong's economy", Billy Mak, associate professor at the department of finance and decision sciences at Hong Kong Baptist University, told the Post.
This is controversial as it marks the first time Chinese criminal law will be enforced in Hong Kong territory.
Some opposition lawmakers argued the move would be a violation of the Basic Law, Hong Kong's mini-constitution under which it retained its own legal system and civil liberties after reverting from British to Chinese rule in 1997.
Protesters dress as People's Liberation Army (PLA) during a protest outside the Western Kowloon Station against the opening ceremony of the Hong Kong Express Rail Link in Hong Kong, Saturday, Sept. 22, 2018.
The case of several Hong Kong booksellers, two of whom were allegedly abducted by Chinese agents from Hong Kong and Thailand respectively, hangs large over the project.
Lam then headed to Guangzhou on a special train with Chinese officials.More news: Interpreting LeBron's welcome message to Anthony Davis
More news: Iran summons 3 European diplomats over parade attack: state media
More news: Iran warns US, Israel to expect a ‘devastating’ revenge
"Perhaps this is a sign of greater integration between Hong Kong and China", he said.
This is the name of Beijing's master plan to combine the cities of the Pearl River Delta region - including Hong Kong, Macau, and nine cities in neighbouring Guangdong province - to foster greater economic and technological development to rival the bay areas of San Francisco and Tokyo. "It's very smooth when it hits speeds of 200 kilometres per hour".
"It is quite convenient for businesses, but this rail is clearly about further integrating Hong Kong with mainland China", said Bosco Wong, another Hong Kong passenger on the train. Travellers will be able to ride from Hong Kong to 44 destinations in Mainland China destinations without changing trains, making the city an ideal starting point for multi-destination journeys through China.
"The XRL train has slashed my commuting time to one hour from three hours", said Alex Leung, a Hong Kong entrepreneur working in Shenzhen who is considering moving his office closer to Futian high-speed railway station.
"I don't know whether it is really good if we just become another city in the Guangdong province".