River Severn References Citations Bibliography The Severn Tunnel: Its Construction and Difficulties (1872–1887) by Thomas A. Walker (1st edition 1888) reprinted edition 2004, Nonsuch Publishing Ltd, Stroud, England . Reissued in 2013 (from fresh photographs of the 1890 second edition) by Cambridge University Press, . (Walker was the contractor entrusted by the chief GWR engineer Sir John Hawkshaw with rescuing and completing the tunnel after the 1879 flooding) Railway Tales of the Unexpected by K Westcott-Jones , 1992, Atlantic Transport Publishers. Further reading External links History of the tunnel from the Great Western Archive Building the Severn Tunnel, how divers tried to seal the Great Spring River Severn Transport in South Gloucestershire District Buildings and structures in South Gloucestershire District Railway tunnels in England Railway tunnels in Wales Tunnels in Wales South Wales Main Line Transport in Monmouthshire Tunnels completed in 1886 Tunnels in Gloucestershire Tunnels in Monmouthshire 1886 establishments in the United Kingdom Car shuttle trains