"Subway Line 6 will far exceed the current high speed of 80 km per hour (in the Beijing subway system)," Wu said. "It will only take 48 minutes to travel the whole line, in part because the stations it connects are pretty far apart from each other."
The longest distance between two consecutive stations on the line is 4,001 meters, according to the department.
Beyond capacity and speed, Line 6 will connect to the deepest station in the capital's underground transport system.
The line's connection to the existing Dongsi station, where Line 5 now goes, will lie 34 meters underground, the department said.
Nearly 235 wells have been dug around the station to prevent water from seeping into it. All of them are 142 meters deep and 1 meter in diameter, according to Zhuo Linjian, technical supervisor of the Line 6 project department of the China Railway Tunnel Group.
"The construction team has overcome lots of the difficulties that arise from complicated underground geological conditions," he said.
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