Oh, yeah - I also love those old (often NIB), beautiful PS1 steamers in general, and they just cry out for an ERR kit.
That "swiveling circuit board" is something that I had not envisioned - good idea. It may find its way into one of mine one day (I have an MTH Niagara that doesn't run right...Cruise Commander and RS may show up there).
Anyway, great work; good ideas. And they're NYC locos. Win-win-win.