I'm considering modeling the D&RGW, because Denver to SLC has some geographical significance to where I live. But I'm curious, what features or characteristics is it about a particular road that one should be considering when trying to model one? What kind of research is done, or should be done, to capture that recognizable essence of a particular railroad? And, what questions should I be asking myself in order to focus that research? Is it era? A specific locale along the route, or section of the route? And I guess, to some degree... if someone was modeling a particular RR, would a well versed modeler recognize it as such if there were no obvious references to it? And if so, what are some of the consituent parts of that identity? Thanks for any thoughts you may have! G.