DRGW Olive green boiler paint color for airbrush

Hey y’all.

I’ve been planning on airbrushing one of my engines to have the Rio grande’s green boiler jacket. My only issue is I cannot find anything online that matches this color. The color I’m looking for is more specifically the one that D&RGW 491 wore for a little bit.
Here is that color:
https://imgur.com/0wtsEeb

Any help is appreciated.
Thanks!

Could you ask the Colorado Railroad Museum what color they used?

Honestly, I didn’t think about that. I’ll see if i can

It might be some kind of olive drab. I don’t know for sure. If all else fails, zoom into the boiler on the picture, print it off, and take it to the paint department of your favorite hardware store and see what’s closest-looking.