Freight trains have a much lower fraction of human labor as cost vs. benefits relative to trucking or cab driving. 1 truck and driver carries 20 tonnes. 2 engin

Freight trains have a much lower fraction of human labor as cost vs. benefits relative to trucking or cab driving. 1 truck and driver carries 20 tonnes. 2 engineers on a freight train carry close to 20,000 tonnes, so there is only 1/50th (ish) the benefit.