As promised are the picture of later PS3 and earlier PS2 Cab Forward engines. After uploading these photos, I realized my digital camera could use a little updating.
Overview of the locomotive:
Top view of the cab & boiler (PS3 on the left):
Builders plates & Exhaust stacks (the PS3 is missing two of the labels applied to the PS2)
The Tenders (note the difference in darker lettering on the PS3 tender):
Front view of the cabs
More views of the locomotive:
The next two pictures are close ups of the exhaust:
the PS3 is first and the paint appears thicker? it just fills in these small spaces more and slightly takes away from the exterior detail
The next two photos really show the difference in the paint:
PS3 is on top and PS2 on the bottom. Again the thicker paint takes just a tiny bit of the sharp detail away from the PS3
I realized i didn't focus much on the tenders so here is another shot:
PS3 on top & PS2 on the bottom.
The difference in lettering shows up here as well as the flatter paint used on the PS3.