David,
I don't know much about Scale S Gauge railroading, I am one of those Hi-rail guys.
But I think you might find something you like looking at American models;
http://www.americanmodels.com/locos/
Or try Portliness Hobbies for old S Helper Service inventory
http://64.251.10.24/~worldofw/...age=results-new.html
Or take a look at River Raisin models:
http://www.riverraisinmodels.com
Aflyer