Bud,
As always your post shading is awesome! As for that PRR Engine, I too spent a lot of time up close and personal as I tagged along with my older brother who was/is a Rail Fan and especially Pennsy/PC/ whatever. There were some of those Brunswick Green Locos you would swear were black even standing next to it not moving. That color was very elusive and I think Polysacle/Flowuil Nailed it!
RAGIII