The Pearl River Delta Metropolitan Region Intercity Railway System (Chinese: 珠江三角洲地區城際軌道交通, abbreviated as PRDIR) is a regional higher-speed rail and suburban rail network being gradually constructed in the Pearl River Delta (Guangdong–Hong Kong–Macao Greater Bay Area), People's Republic of China.

The project's goal is to have every major urban center in the Greater Bay Area to be within one-hour travel by rail to Guangzhou.

[14] Construction was completed in June 2013 and test runs began in 2014, but the first segment of the line, from Xiaojinkou-Changping East did not open until 30 March 2016.

[16] On 23 January 2024, operation of Guanghui ICR has transferred from CR Guangzhou to Guangdong Intercity company.

On 23 January 2024, operation of Guangzhao ICR has transferred from CR Guangzhou to Guangdong Intercity company.

It has a top speed of 200 kilometres per hour (120 mph) and will use 6 car CRH6 EMUs capable of running up to 2.5-minute frequencies.

[22][17][23] An underground regional railway connecting Shenzhen and Huicheng District in northern Huizhou.