File:J. P. Ackerley of Yonkers demonstrating that an elevated train would not fall off the track!.png
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![File:J. P. Ackerley of Yonkers demonstrating that an elevated train would not fall off the track!.png](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0f/J._P._Ackerley_of_Yonkers_demonstrating_that_an_elevated_train_would_not_fall_off_the_track%21.png/800px-J._P._Ackerley_of_Yonkers_demonstrating_that_an_elevated_train_would_not_fall_off_the_track%21.png?20211019015558)
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