Of the 300 structures described by Martin Smith in his book - (1984), six were iron trestle viaducts and one wooden. Two of them, Belah and Deepdale, were on the trans-Pennine South Durham & Lancashire Union Railway of 1861, later becoming part of the North Eastern Railway. 196ft high, Belah was the country’s second highest after Crumlin in South Wales at 200ft. At both, traces of masonry abutments are all that remain. Likewise, only traces of
