These are some British freight car builds that I found around the internet and modified substantially. I am including the LDD file in the bottom of this page.
About this creation
This was an originally from a Brickshelf user named ScottNick. I modified it to be build able in real life.
This Box Van was a Banana Van when I downloaded the instructions from Railbricks.com for free. I changed it to brown and made some structural changes. It is also 100% build able.
This Rock Gondola was my own design.
This Fuel Tanker was from the Hobby trains official LEGO set, but modified to be less parts-intensive.
This Guard's Van was first designed by Fireglo here on MOCpages. I changed it from the bottom up to be more stable.
(Credit for the Guard's Van goes to my good friend Fireglo, designs for the Box van goes to the awesome people at the Railbricks website / magazine, while the well wagon is from another great friend, ScottNick.)