long on 6 piers. It was replaced by an embankment in 1923. Penryn Milepost 308.75, north of Penryn. () A Class A viaduct high and long on 5 piers. It was replaced by an embankment in 1923. Collegewood Milepost 309.5, south of Penryn. () A Class A viaduct high and long on 14 piers. It was replaced by a new stone viaduct on 22 July 1934. This was the longest viaduct west of Truro and the last timber viaduct to be replaced in Cornwall. The piers of the original viaduct still stand and are listed Grade II. See also List of railway bridges and viaducts in the United Kingdom Angarrack Viaduct Penponds Viaduct References Further reading R J Woodfin, The Cornwall Railway to its Centenary in 1959, Bradford Barton, Truro, 1972, ; Chapter V gives a detailed analysis. External links Remember Falmouth: photograph of Penwithers viaduct Bridges by Isambard Kingdom Brunel Railway bridges in Cornwall Railway viaducts in Cornwall