When was the last time anyone hauled coal on the interstate highway system? And is it really practical to move a 400-car load of wheat in highway trucks? For any really voluminous and heavy cargo, if you are not near a major body of water, there is only rail.
When was the last time anyone hauled coal on the interstate highway system? And is it really practical to move a 400-car load of wheat in highway trucks? For any really voluminous and heavy cargo, if you are not near a major body of water, there is only rail.
For long hauls you have a point, but remember the bulk cargo is (almost) always hauled to a collection point for long haul by truck. Also normally air freight is only used for urgent high value cargos, but was used in the Berlin airlift to haul coal.