Andy:
There was an outfit headed by Charles Wood who made colors to match classic trains. I did a little research and found that the company has changed hands. Go to www.trainenamels.com. Their phone number is 330 333 9831.
It's 11:24 PM here on the East Coast and so I did not try the phone number nor do I know to what extent that the business is still up and running. Check it out tomorrow and let us know.
I remember when I checked them out a few years ago that they made a green color that matched the base of the various Lionel gate men (45, 145, etc.) I believe that is the same green for the milk platform.
John Knapp