Road transportation emits about a hundred times more for the same mass and distance. I'm sure they're referring to ICE vehicles not electric, but the former still accounts for the vast majority of automobile freight transport.

https://climate.mit.edu/explainers/freight-transportation

According to this link, rail is more efficient per tonne-kilometer than ships are, which contradicts many others in these comments claiming the opposite without supporting citations.

Per the source above, rail is most efficient at 128k, then ships at 97.3k, then road at 10.8k, where units are in tonne-kilometers shipped per tonne of CO2 emitted.

Everything? It's not close, trucks are very inefficient compared to trains and boats.