Steamer posted:years ago, one of the mags did a chart on Prewar paint and modern paints. I THINK it was either Walt Hulsweder or Dr Tinker.
Someone on here recommended Rust-oleum Metallic Charcoal 244228 for Gunmetal. I used it on the home made tender for my 225E, and it looks pretty close to me.
That article appeared in the March 2001 issue of Classic Toy Trains. The author listed a few comparable paints from Ace, Krylon, Rustoleum and Tru-Value.