As a Southern modeler, the consolidations used on the Southern consisted of 5 classes of locomotives. These were G, H, I, J, & K. There were several subclasses within these.
The Bachmann 2-8-0, while a superb model is larger than the 2-8-0 that was the 722. The real 722 is a Ks, which is a lot smaller than the Bachmann engine. The Bachmann engine is closer to the largest 2-8-0's on the SRR, the Ks-3 class, of which there were 10 locos.
But remember, its your railroad, you can do what pleases you, and not be disappointed. I have a couple of the locos on my layout, and they are all painted into SRR colors.
According to Prince's book on the SRR, these were built by Richmond in 1926. They were the heaviest of the consols on the SRR, and had stokers, feedwater heaters. They had an engine weight of 246,000, and a tractive effort of 54,000 lbs.
However, the Bachmann locomotives can be re-detailed into more of a SRR type engine very easily, simply by the replacement of some of the parts with brass parts from either Precision Scale Company
http://www.precisionscaleco.com/ or Cal-Scale and Cary parts from Bowser,
http://bowser-trains.com/In%20Stock%20Pages/In%20Stock%20Cal%20Scale.htm Of course, you'll need pictures of the specific engine to copy it by.
As an aside, to get a accurate model of the SRR 722, Overland imported in the 1970's a model of the SRR Ks 2-8-0 in brass. The only place to get one is probably from any of the brass dealers on the web, or E-bay. These cost generally in the range of $200-400.
