Cornish viaduct

These were originally built of wood on masonry piers, so reducing the cost but maintenance cost more. Plymouth to Truro 7ft single track opened in 1859, replacement started in 1875 but there was a dispute in 1884 between the Cornwall Railway and the Great Western Railway  which was leasing the line. The lease precluded the conversion of the line to 4 ft 8+1⁄2 in standard gauge, and the Cornwall Railway refused to pay for the widening of the viaducts during rebuilding sufficient to accommodate a double line of standard gauge tracks. Following the amalgamation of the two companies on 1 July 1889 all the remaining viaducts on the main line to Truro were replaced. Most were either rebuilt in situ or by a replacement viaduct built immediately alongside.