Todd,
I believe that particular shade was Krylon’s Satin Forest Green. Be careful as to brands as all forest greens aren’t the same shade.
Correction: It was hunter green.
Krylon’s Camouflage Olive (olive drab) makes a fairly credible pullman green btw although maybe just a tad too light. It’s a flat color but you should be able to over spray it with a clear gloss…be sure and test for compatibility between the paint and the gloss before applying it to the cars though.