File:Model of a compressed air shield as used for the Pensylvania Railroad Tunnels in NYC area.jpg
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![File:Model of a compressed air shield as used for the Pensylvania Railroad Tunnels in NYC area.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/81/Model_of_a_compressed_air_shield_as_used_for_the_Pensylvania_Railroad_Tunnels_in_NYC_area.jpg/800px-Model_of_a_compressed_air_shield_as_used_for_the_Pensylvania_Railroad_Tunnels_in_NYC_area.jpg?20200229102040)
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