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Chinese engineers build a massive high-speed railway bridge by swinging two
7,000-tonne sections into place - while another high-speed railway bridge
underneath remain open

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     * The impressive engineer feat was completed in just 73 minutes at
       night
     * China has the world's longest high-speed rail network and it's
       still expanding

--
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   Chinese workers are constructing a huge high-speed railway bridge over
   another high-speed railway bridge which remain open.

   To complete the challenging engineering feat, workers built two bridge
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   (419 feet) long, rotated 19.5 degrees counter-clockwise simultaneously
   before connecting.
   Before: A high-speed train whizzes on Ningqi Railway before the two
   bridge sections connect
   Before: A high-speed train whizzes on Ningqi Railway before the two
   bridge sections connect

   Before: A high-speed train whizzes on Ningqi Railway before the two
   bridge sections connect
   After: The massive girders are linked above the Ningqi Railway after
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   professors from multiple universities to calculate the most ideal
   rotating speed and angle.
   China has the world's longest high-speed rail network, expected to
   reach 18,641 miles in 2020.
   China has the world's longest high-speed rail network, expected to
   reach 18,641 miles in 2020.

   China has the world's longest high-speed rail network, expected to
   reach 18,641 miles in 2020.

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   is expected to complete next September.

   It will support high-speed trains with an average operating speed of
   250 kilometres per hour (155 miles per hour).

   China has the world's longest high-speed rail network with more than
   20,000 kilometres (12,427 miles) of track.