Coal trains release massive amounts of toxic coal dust, even when preventive measures are taken. If trains are restored to the North Coast rail line, it is a certainty that we will see regular spills, derailments, fires and collisions.
The only possible way to make the North Coast rail line financially viable is through very high-volume freight shipments. Coal is the only commodity that meets that requirement. The rail line could carry other commodities as well, but it would definitely carry coal.