Here are some links to other sites I think are worth a visit:
BeastOBerwyn's Flickr - David Dawson
End of the Line - Ian Furness
EuroSprinter's Flickr - Jamie Hunter
Foto Rail - Kevin Smith
The Iron Road - Scott Borthwick
Rail Net - Marcus Dawson
Tracks Visited - Bob Lumley
Here are some other websites that I find useful: