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The railway through Bath Spa railway station is partly elevated, necessitating a variety of bridges and viaducts.
Immediately west of the station is a very heavily-skewed lattice girder bridge. This replaced I. K. Brunel's attractive 1840s bridge, which was of unusual construction. Contemporary photographs show what appears to be a typical cast iron double span arch bridge. However, contractural problems prevented an iron bridge being procured, so Brunel designed a structure predominantly made of wood, having two spans with six arches each, laminated from five layers of 6" Memel (Baltic) timber, treated by Kyanising. The spandrels above the outermost arches were ornamental iron castings with a Gothic theme, but elsewhere timber supports were provided between the arches and the deck. The ends of the ribs sat in cast iron 'shoes', and the whole structure was provided with wrought iron ties, the largest being horizontal tie bars set a short distance above the ends of the arches. These were provided with vertical tie bars to minimise sagging.