Mellow Hudson Mike,
What an amazing response. Thank you for taking the time to share this information. It seems strange to me that our hobby train manufacturers wouldn't come up with a standard color scheme that they all share. On the other hand, the creative aspect to this subject and the competition to strive to achieve accurate historical representation probably plays into it as well. In other words, maybe no one can agree on a standard. Perhaps it is the same forces at work that has created separate command systems.
These real engines still exist in railroad museums. Couldn't they color match based on walking up to these old relics and matching the paint?
Mike