Originally posted by JohntheBike
					
						
						
							
							
							
							
								
								
								
								
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		It worked by having border crossings and customs posts. It worked the way normal borders work. Freight vehicles queue up, go through checks and then proceed.
Take a look at freight traffic crossing the border between Switzerland and France.
It worked as satisfactorily as any hard border crossing does. Back in the 50s/60s the volume of goods flowing was considerably less than now and the urgency was less, so a 2-4 hour delay would mean Belfast to Dublin would take 8+ hours.
Add in the extra volume that makes the journey these days and the delays would be longer.

				
				
				
				
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