Even if the train’s electric power comes from coal, not carrying fuel with you is a win from an efficiency standpoint. There are some military planes flying on

Even if the train’s electric power comes from coal, not carrying fuel with you is a win from an efficiency standpoint. There are some military planes flying on biofuel, so ideally we’re not that far off. https://www.energy.gov/eere/bioenergy/aviation-fuels https://www.energy.gov/eere/bioenergy/aviation-fuels