I never knew that. I did notice that photos I had seen of the Congressional had Tuscan GG1s on the headend, but I assumed the silver versions were just scarce on the roster. Thanks for pointing that out.
I have a Brunswick Green JLC five stripe GG1 and that seems to avoided the zinc pest. I have another silver G that I am going to tackle soon. I never ran that one either, so I am curious to see if it has any issues other than the rotten truck frames.
The pans on my silver GG1 needed some adjustment to get them to go down all the way. They have worked fine since…