I think that the Robertson entry was just a typo; a "5" instead of an "8."
Also, the numbers that you gave make it look like 1447 could be a good Grant number for a Toledo, Cincinnati & St. Louis RR 2-8-0. That's the number that I think I make out on the builder's plate in the photo of an ex-TC&StL loco on the Mason & Oceana RR.