In article ,
kevin smith wrote:

if you are talking in the country then i Believe causey arch is the oldest
surviving "raiL" bridge in the world

Not been used to carry a railway in a very long time, though - not
since before 1800, IIRC.

'sides, if we're talking structures no longer in use then the oldest
recognisable railway structure known is clearly the Diolkos of
Corinth... (also the longest-operating public railway, in use from
about 600 BCE until around 65 CE - beat that!)

--
Andy Breen ~ Interplanetary Scintillation Research Group
http://users.aber.ac.uk/azb/
Feng Shui: an ancient oriental art for extracting
money from the gullible (Martin Sinclair)