« Reply #4 on: Sunday 03 May 15 15:40 BST (UK) »
do you mean the railway bridge?
http://www.engineering-timelines.com/scripts/engineeringItem.asp?id=1341I've had a look through the Cambrian online index for mentions of the bridge, works various but none mention Henry Griffiths. There are mentions of a Henry Griffiths applying for alcohol licences -
25 Aug 1876 Henry Griffiths, farmer of Pengelly, applied for a licence to sell liquors
15 Sept 1876 application for an ale house licence for building under construction was refused - Henry Griffiths, Gowerton
6 Oct 1876 2 different Henry Griffithses were refused licences on 2 proposed houses near Gorseinon station
Also, birth of a daughter in 1893 to Henry Griffiths of Albion House, Gorseinon.
http://www.swansea.gov.uk/cambrianYou can search various newspapers online here, many results for Loughor bridge
http://papuraunewyddcymru.llgc.org.uk/en/home
Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb