File:Fig 7 Profile along the Low Grade Division of the Allegheny Valley Railroad.jpg
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![File:Fig 7 Profile along the Low Grade Division of the Allegheny Valley Railroad.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Fig_7_Profile_along_the_Low_Grade_Division_of_the_Allegheny_Valley_Railroad.jpg/800px-Fig_7_Profile_along_the_Low_Grade_Division_of_the_Allegheny_Valley_Railroad.jpg?20191215153808)
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