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Yarm is dominated by a 43-arch railway viaduct, extending the Leeds and Thirsk railway from Northallerton to Stockton and Hartlepool. Construction work lasted from 1848 at 1852 and this gigantic enterprise produced a series of impressive statistics. The forty-three arches span 760 yards and include 7.5 million bricks and 139,000 cubic feet of stone. An army of navvies earned up to £1 a day during construction work. A stone tablet positioned in an arch above the river records the achievements of Thomas Grainger and John Bourne in designing the viaduct.