Thanks,
I agree, the textures and lighting make all the difference, the actual modeling is just research and work. I appreciate the simulations, but I'm not really into that, nor any animations at this point, you never know though. Rendering a model to the point that it's indistinguishable from reality, creating an image which captures that quality seemingly inherent in all narrow gauge imagery, or producing highly detailed reference images (cut-aways, exploded drawings) useful to modelers or interesting to railfans - those are my goals. Or simply something to while away the hours. Naw, let's go with the first one.
I use Carrara Pro 6.2, mainly because that's what I have and know.