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			Many years ago I worked in Conshohocken. My route to work took me through a large stone quarry.  
 
They had these trucks. 
 
They were a sight to see, indeed.  
 
There was one crossing where you had to stop and make sure that none of these things were intending to cross ... they have about the same ability to stop on a dime that a freight train does.
		 
		
		
		
		
		
		
			
		
		
		
		
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