Compressed nitrogen used to slide 800 tonne subway into place

The 800 tonne reinforced concrete underpass box was installed through an existing railway embankment at Rochester.

UK: An 800 tonne reinforced concrete underpass box 28 m long, 7·6 m wide and 4·0 m high with 0·5 m thick walls was installed through an existing railway embankment at Rochester during a four-day blockade on April 18-21.

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