File:Waterproofing installation at the secant wall of the Track A approach structure which transitions trains from surface track to the tunnel below ground. (CH061A, 12-12-2017) (25191183338) (2).jpg
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![File:Waterproofing installation at the secant wall of the Track A approach structure which transitions trains from surface track to the tunnel below ground. (CH061A, 12-12-2017) (25191183338) (2).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Waterproofing_installation_at_the_secant_wall_of_the_Track_A_approach_structure_which_transitions_trains_from_surface_track_to_the_tunnel_below_ground._%28CH061A%2C_12-12-2017%29_%2825191183338%29_%282%29.jpg/450px-thumbnail.jpg?20180207020345)
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