If I suddenly owned it (and ignoring whatever it is they do in HO), I would do batches of well researched paintschemes on those 65' gons, maybe even some grafitti covered cars as well, with loads and weathering - to increase the apparent value of the rather dated tooling.
I would also switch to Atlas trucks/accumates, as they make a huge, huge difference in the appearance of their gons and boxcars.
A lot of people don't realize that they had at least 3 50' boxcar bodyshells and at least 2 60' boxcar bodyshells. They did a lot of foobie paintschemes and a lot of stuff looked like it was phototypeset using Microsoft Paint, but there is a lot of potential for some good stuff there.