The railway between Castleton and Grosmont was opened on 2 October 1865 and this bridge is between those stations.
The date fits perfectly because “Head, Ashby and Co.” only existed from 1860 to 1867, after that they were called “Head Wrightson and Co Ltd”
Head, Ashby & Co Bridge, Danby
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There is another one at Castleton station.
Neither this or the Castleton Moor bridge still exist 🙁
They were replaced circa 2019.