Here's a website I stumbled across some time ago that has quite a bit of general info on many different industry types that could be helpful to the modelers out there. http://www.carrtracks.com/indndx.htm
Good find Matt! The additional information about industries goes well with the Indman database from the OpsIg website: http://www.opsig.org/
Yep...the OpSIG database is priceless. FRISCO note: Check out the cement section for a shot of a Frisco covered hopper.