Help with B&O Loco Colors

I’m in process of painting an ALCO FA/B-2 engine set in the B&O paint scheme. I would like to paint them the gray/blue/black colors. Can anyone tell me which specific PolyScale, or Floquil colors I could use. Mostly for the gray. I’ve looked at some prototyp photos but I’m not 100% sure of the shade. I’m looking for someone with past experience.

Try this…go to the “Resources” section of this site, and click on Historical Societies…select “A-C”, scroll down and click on Baltimore & Ohio…on their cover page, on the right, select “B & O Newsgroup”. They show you how to join. You should be able to get an answer there. Good luck & regards…Mike…a B & O fan forever.
[You can also get a really nice photo of a B&O Alco FA on their cover page, by hitting the ‘change photo’ feature.]