One of the best industries I modeled was an appliance company. You can see a picture of it at: http://l3rclub.rrdepot.com/gallery/corner-1.html
The building I have is rather large but could very easily be made smaller. On the left end, two tracks enter the smaller portion of the building for delivery of raw materials, which can include box
cars, tank cars, and even steel coil cars. I decided on an interior unloading area so I didn't have to model all the unloading equipment.
The two doors on the front of the building are spaced for 60' cars with cushion coupler pockets as that is what I use to ship my appliances. There is also a truck loading door on the one end
(see the truck) to ship items by truck. I won't go into detail here as the page linked above tells you how I built this building.
This was a very simple building to make and I am really impressed with it. You will see a smaller building in the picture that was built with the same materials in less then 3 hours.
Shane Lambert