Check out this video of the awesome NASA shortline railroad.
The video outlines how the railroad has been used to move items for the space program at the Kennedy Space Center in Cape Canaveral, Florida. Items to note in the video include not only the unusual cargo, but also the specialized cars used by the line.
Now, who's going to build one to go with their Shuttle Expedition set?
Thanks to Larry P. for bringing this one to my attention.