A while back there was a web site which listed the various
designations for freight car types ie box cars, gondolas etc.
which I’m trying to locate.
http://www.nakina.net/aartype.html
Hope this one suits your needs.
You can also try
http://www.rrpicturearchives.net/rsAARTypes.aspx
Click on a type and it will provide more detailed information. Plus you can see pics by selecting the reporting marks for which pictures have been entered into the website.
Try GATX web site.
They list railcar types and pictures
The websites mentioned above are the ones
I was trying to locate. Many thanks.