Consider these:
		
		
	
	
		 
	
and
		 
	
Note the horizontal rectangular red signs that say "STOP"
I've never seen such a thing!! Is this unique to the OP&E, or did other railroads use them?  Is there a web resource for this and any other signs used for railroads?
 Is this unique to the OP&E, or did other railroads use them?  Is there a web resource for this and any other signs used for railroads?  
(Yes I Googled railroad signs, but all I get are the ones meant to be obeyed by automobiles)
				
			 
	and
 
	Note the horizontal rectangular red signs that say "STOP"
I've never seen such a thing!!
 Is this unique to the OP&E, or did other railroads use them?  Is there a web resource for this and any other signs used for railroads?
 Is this unique to the OP&E, or did other railroads use them?  Is there a web resource for this and any other signs used for railroads?  (Yes I Googled railroad signs, but all I get are the ones meant to be obeyed by automobiles)

 
	
