File:Block semaphores at milepost 543.9; Riddle, OR, August 1993.jpg
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![File:Block semaphores at milepost 543.9; Riddle, OR, August 1993.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Block_semaphores_at_milepost_543.9%3B_Riddle%2C_OR%2C_August_1993.jpg/411px-Block_semaphores_at_milepost_543.9%3B_Riddle%2C_OR%2C_August_1993.jpg?20190913143044)
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