UK rail bridges and viaducts to walk over

Long, high or interesting rail bridges and viaducts you can walk over. Plus a few canal aqueducts as well.

They are graded from 1 to 5 to give an idea of how worth a trip they are.

There are many more which have no public access.

The bridges and viaducts

Not in the UK are

Myra Canyon (Kettle Valley Railroad) walk near Kelonwa in BC, Canada with 18 wooden trestle bridges, 2 steel bridges, 2 tunnels, and bears :)
Walk over the Hudson (Poughkeepsie Bridge ) not far from New York City, USA - at 2 miles long, the 2nd longest pedestrian bridge in the world
In Prague, you can walk over the impressive modern 42 m high Nusle bridge that carries metro lineC beneath it connecting Vyšehrad and I.P Pavlova. (pleasant views of the frequent mainline trains and trams in the valley far below). Nearby, but a long way down, if you want to get closer to said trains the 200 metre long Železniční most carries trains and a footway across the Vltava to and from Smichov.

Thanks to members of RailForums.co.uk for help in compiling this list.