A number of details, including the ditch lights, were added to these models after they were catalogued as a result of customer requests (including mine) to make the models more prototypical to the engines as they appear today, especially since they were being advertised as models of Bennet Levin's PRR E8's and not models of the engines as they were when on the PRR roster.
I have a set of these and they are gorgeous.
Here's an old video of mine in action:
Andy