OK but trains do not kill the environment more than cars do - quite the opposite, in fact. "It's all connected maaaan" only gets you so far, you do need to consider HOW things are connected. Vicious cycles are not the only cycles.
I think that it's because just having the trains won't/wouldn't fix the issue of unhealthily extracting from the Earth, like putting a bandage on a cut. :3c
One freight train uses less fuel than 70 cargo trucks to carry the same load, even assuming a diesel train and not electric. It literally does improve the issue of unhealthily extracting from the earth.