Asked a similar question a year or two back, but just to refresh ---
Please view the attached doc and the article in the Atlanta Constitution Newspaper re the Ingalls 4-S demonstration to several railroads. To date I have not found any of the 'Proceedings of the Southern Southwestern Railway Club for 1946. Can anyone help?
Also I would expect (if I am lucky) that in the Southern Railway archives there would be a 'report' and/or evaluation of the demonstration at Atlanta at that time. To Ike and everyone involved in logging all the archives info, keep and eye out for me. I would join you but alas I live far away in New Zealand.
So basically any info that refers to the Ingalls 4-S is of interest. February here in NZ already.