I know for a fact that Walthers is the only one that has a model of a diesel prime mover. It is a 567 B or C. If you want to model a 645 or a 710 series prime mover, you will need to buy extra kits ( To go from 12 cylinder to 16 by cutting and splicing) or cast your own from resin as I have. To model the 645 or the 710 , you will need to look at a enclycopedia of deisel locomotives and see if any of the drawings show any details that may need to be added.