File:Concrete truck and concrete pump in Harold Interlocking, both machines help to complete a portion of the wall and roof slab of the Track A Approach Structure. (CH061A, 03-21-2018) (39162151150).jpg
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![File:Concrete truck and concrete pump in Harold Interlocking, both machines help to complete a portion of the wall and roof slab of the Track A Approach Structure. (CH061A, 03-21-2018) (39162151150).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/68/Concrete_truck_and_concrete_pump_in_Harold_Interlocking%2C_both_machines_help_to_complete_a_portion_of_the_wall_and_roof_slab_of_the_Track_A_Approach_Structure._%28CH061A%2C_03-21-2018%29_%2839162151150%29.jpg/800px-thumbnail.jpg?20181120181731)
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