Here is another thought on railroad and some logging camps. They built  
portable buildings that sometimes exhibited sled-type foundations that could be  
hauled down roads or up on flatcars to relocate the camps. I watched a  
presentation on California railroad camps which were simply abandoned out in a  forest 
and, although rotten, the contents were in relatively pristine condition  for 
archaeology mapping and documentation. 
 
Ron May
Legacy 106, Inc.