The world’s first fully enclosed noise barrier for high-speed trains, built on a section of the Shen-zhen-Maoming Railway in Guangdong, is to come into service soon, China News reported on May 10.

The barrier, which is 2 kilometers long and cost 187 million yuan ($28.4 million) in investment, is just 800 meters from Birds’ Paradise, China’s biggest natural bird park housing more than 30,000 herons.

It was built to protect the natural ecology of the scenic spot, as it is able to reduce stress caused to birds through noise, vibration and light when the high-speed trains speed past, according to the China Railway Guangzhou Group Co., Ltd.

The project manager stated that the design and construction of the barrier fills in a world gap in research of sound insulation and noise reduction of high-speed trains.