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					Originally Posted by  northcrunk
					 
				 
				Seen lots of 4 car trains on the south line. The NE line.......not so much. Elitists. 
			
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					Originally Posted by  Handsome B. Wonderful
					 
				 
				3 car trains going west are barely  filled most of the time, it would be a complete waste running 4 car  trains on that line. 
			
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Yes.  The Blue Line West  is a newer line where the demand hasn't grown yet, and has a lower ceiling in that regard, and the Blue Line Northeast is indeed busy, but the Red Line South has the most ridership by a significant margin, so 4 car trains will be deployed here first.  The Blue Line will get some eventually once the new cars come into service.