It is a plan for the gradual implementation of a regional rail system across the metropolitan area.

The system will eventually connect with Jiangsu Yangtze MIR and Hangzhou Greater Bay Area network.

On July 2, 2021, the National Development and Reform Commission issued a notice on the issuance of the "Multi-level Rail Transit Plan in the Yangtze River Delta Region".

[3] The plan proposed that by 2025, the Yangtze River Delta on the track will be basically completed.

The operating mileage of arterial railways is about 17,000 kilometers, of which high-speed railways are about 8,000 kilometers, forming a three-hour inter-regional traffic circle between the Yangtze River Delta and neighboring urban agglomerations and provincial capitals.