This Way to the Forums! Give it a try! It Works! (sort of...)
<googlemap lat="51.743666" lon="-2.221384"> 51.743546, -2.222006, Wallgate Viaduct 51.744569, -2.219496, Stroud </googlemap>
There's a gap in the viaduct where the River Frome passes through. The stonework on the right hand side supports the A419 Dr Newton's Way bypass which covers the site of Stroud Wallgate.