Norfolk Southern's Wabash Heritage unit leads NS I6Q (Extra section of 26Q) Eastbound along the causeway of Nickajack Lake on a beautiful Wednesday morning. At the time of snagging this train, I6Q was running as CSX Z381-14, as Norfolk Southern's Memphis East district joins with CSX's Chattanooga Subdivision at Stevenson, AL, to make their way through the mountains and into Southern Chattanooga.