Add detail to boxcars with open doors.  Add some crates, boxes, tarp load, or figures to your boxcars that have open doors.  There are even lumber, barrel, or bag loads you can place into an opened boxcar.  You can even add a fake wood flooring to add more detail.

For the TL;DR - just scroll down an look at photos is useful since it's about architecture :) Feedback appreciated !

I want my layout to have a high level [ ... ]

I finally decided on the Zize of my layout. A mere 30 inches wide, L shape, length 77.5 inches on the short and 126.5 on the long. Now I've just gotta come [ ... ]

Here's video of my layout, first in near-total darkness, then in daylight. [video:http://www.youtube.com/watch?v=cLmc2DIJHkY 100x100]