I agree with the reasoning on the green being lighter to ensure there is no confusion with black.
There is a large variance in the use of the name, to ID various colors over the years.
Origin in some German or Dutch town phonetically similar in name. Dark green with yellow red, metal hues.
In PRR shops it was "dark green locomotive enamel" on the cans or barrels I think. A dark green near black, but turned more green from weathering as a copper pigment in the green changed patina to become greener but its still dark.
The first run of post war Lionel GG-1 units, the green to black ratio used was actually reversed in the mixing of the color, and those engines will be so black you must catch them in the right light to see the green at all. "Hens teeth" but now you know about a rare item to watch out for at the yardsale too
I think its very regal, and elegant. Especially with gold/amber.
Reminds me of Jaguar's darker greens.