Will Grant said: "Still, all the emissions from every steam locomotive on earth is very insignificant compared to emissions from the rest of the world. Its really not that big a deal, and I believe that if you change the rest of the world....you could still happily operate a large number of steam locomotives and not really mind it"
I agree. The problem is very small and the tree planting remedy is largely symbolic. If I were running a coal fired historic railroad, I would not buy into the premise that I needed to offset my carbon. I think it's a slippery slope.