Railay Webcams
 

This Dutch one is currently a favorite - http://www.railcam.nl/

Can anyone recommed any more? There was a good Japanese one I found off another forum but I cant remember its name :(

Not exactly designed for rail (more for checking traffic on the motorway), but the Aotea Quay webcam gives a good view of the Wellington rail yards.

Here is an USA site with 20 second updates or live streaming.

http://www.railserve.com/jump/jump.cgi?ID=23657

Or this site for a whole lot of diffrent railcan sites

http://www.railserve.com/RailCams/

West Sumerset Railway web cam

http://www.wsr.org.uk/webcam3.htm