I felt this was a good reference for industrial railroading. Many pictures here. It seems to never end as you page down.
You must copy the entire link below into your browser address bar or click the tinyurl below.
http://www.flickriver.com/groups/1408456@N24/pool/interesting/
For those who don't want to copy the link above I made a tiny url below. I do not know when the tinyurl will expire though. They are time based I believe.