The line will include four new stations, including an underground station at the airport, and is expected to cost Yuan 27.4bn ($US 4bn), including Yuan 800m for rolling stock.

The Beijing - Daxing International Airport section will have a design speed of 250km/h, with the remainder of the line south to Bazhou being constructed for 350km/h operation.

Construction began on the new airport in December 2014 and the project is due to be completed in September 2019.

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