The trains, named the Vibrant Express, can go up to 217 mph. They are equipped with power outlets and wi-fi.
In early 2018, China Railway Corp announced that trips from Hong Kong to Guangzhou would cost $33, raising concerns about whether it would be affordable for low-income commuters.
In addition, construction of the $10.7 billion railway has experienced several delays and is over-budget.
In a 2017 New York Times op-ed, Lian Yi-Zheng, a political commentator, argued that the railway will allow China to undermine Hong Kong’s political autonomy under the longstanding "one country, two systems" arrangement.