The name of this thread could be "The many shades of peacock", but I do want to keep it with "Restoration". The photos embedded below are peacock shades from five sources. All were taken today with my iPad and color checked against the originals.
The baseline for this is the 352E set that was given to my my around 1930. It was only 30 years old when I first saw it, not time for the color to have changed much. It has always looked green to me.
Here is my set.
Peacock is somewhere between light blue and medium green. Here is the 10E labeled peacock on page 69 of the 1976 TCA book. It's sort of blue, distorted by the low resolution printing. 
Here is one from Greenbug's new Standard gauge book.
I'd label it blue. 
Now Doyle's book. Looks light green with a blueish tint.
Then there is the problem of lighting. My photos are usually with incandescent. Here's one of the cars under an LED lamp.
Looks like a greater blue tint.
Now back to my train which I'm preparing to sell as we get ready to move to a senior living community. The sides and ends are almost C-7 but the roofs don't look good, and I want to repaint them to match the sides. I have found Trainenamels to do a very good job of reproducing original colors. 
Their 10-peacock looks green, but it's not the same as my green.
As may be observed in the animal kingdom, one should not put two male birds together, especially peacocks. So I hope my train will be bought by someone who doesn't have a clashing peacock 
