As always, Pete - @Norton - has a point. The various pieces of 3rd Rail / GGD equipment made for the 1940 - 48 Twentieth Century wear different shades of gray. But that's not for lack of trying. I know how hard Jonathan - @GG1 4877 - and Scott Mann - @sdmann - worked to get them to match across a rather lengthy span of production in an ill-fated effort to satisfy @Pete Kruimer. 
In my experience, grays are particularly tough, and the eyeball perception of them varies with ambient light, painting techniques, screen registrations and the like. At this stage of the game, I've given up on chasing "that perfect train."
I have the 1940 Dreyfuss Hudson, the twelve car matching set, and the Beauty Queens, all of which were produced at different times and probably in different places, and while not "perfect," I think they match reasonably well. Below are various examples coupled together for comparison.
Tender to RPO
Tender to E7B
E7B to RPO
Note how the lightning stripe on the B unit drops to match the cars. Almost.
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For anyone who may still be interested in the Weaver cars I reconfigured, here are a couple of pix of the observation car to close with.
Of course, I think my grays are the best! 
Finally, Carl - @Pingman - also had a point above. I should have made this a separate thread instead of inadvertently hijacking @PAUL ROMANO 's. I'll return it to him now, with my apologies.
- Mike
