I do want to mention that I tried to purchase a 3rd Rail PRR S2 - twice. These were used and from different sellers. However when I received them a lot of the wheels from the pilot truck, training truck, and tender were loose in the box. When I tried reinstalling them they were very loose and one truck had a cracked side frame. Both were returned. I think that was an early 3rd Rail engine.
Received some interesting additional info on that 3rd Rail S2. It was the first engine sold under 3rd Rail's brand but not built by Sunset. It was actually a Williams brass product that Williams could not make the final payment on when the engines were ready. Sunset made that final payment, received the engines, made up some boxes and sold the engines under the new 3rd Rail brand.
It makes me feel better that those S2’s were not really a 3rd Rail product. They were not the quality product they have produced since.