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Here's another version of the 1859 map from Old-Maps.co.uk OS County series Northumberland 1859 -1883. There's a bit more detail and you can see quite clearly that after leaving the railway sidings at the old Puddlers Row the main line continues only a short distance before branching off into new sidings which end at the larger of the buildings you mention. My guess would be railway worksheds or industrial buildings ' possibly Bedlington Ironworks.