What particular real locomotives and heavy industrial train cars interest you and why?
I will start us off.
As a child, from the mid 1950s through the1960s, my mother (she did not drive) and I were often passengers on the NY Central, New Haven and PRR trains, and we would occasionally see awesome long freight trains of those railroads. The freight trains were mainly coal, oil tanker and box car unit trains.
That is why the major part of my O Gauge collection consists of models of the above real trains I experienced as a child.
Of course, I have vivid memories of the passenger trains my mother and I rode on, but my memories of the locomotives we occasionally saw pulling freight trains during that era are vague. Whatever your recollection or knowledge is of those locomotives and freight trains would be greatly appreciated.