Coombe by Saltash Viaduct, at 251 miles 38 chains mile post mileage from London Paddington Station via Bristol Temple Meads Station and Plymouth Station (Millbay), was 201 yards in length and 86 feet in height, according to "The History of the Great Western Railway: Volume 2: 1863-1921" by Mr E T MacDermot, revised by Mr C R Clinker, published by Messrs Ian Allan Limited, in 1964.  These dimensions are not guaranteed by the Old Devonport.UK website.

The original Viaduct was replaced by the Great Western Railway Company in 1894.