CSX U324
Second motor is CSX SD70MAC No. 721. The third unit is HLCX SD45 No. 6517, built in 10/1971 as SCL No. 2034.
Published in the May 2009 issue of Railpace Newsmagazine as part of the feature entitled "CSX RF&P Subdivision - Part 1: Richmond to Milford" (page 26).