This is the basic 18-inch mining car I have, it is used to haul square set lumber into the mine it self from a lumber shop/yard at the mine. This one is normally empty, but is set up to take a new product (or more, depending on when I get tired of it LOL) that is 12 square sets put together to form a box like structure. Each square set is 8 by 8 inches by 6 feet long.
My freelanced car is about 2 meter long and 70cm wide.