How did railroad expansion make natural resources more available in the united states?

The expansion of the railroad system in the US made natural resources more available in the United States by making the transportation of such resources far easier and cheaper, since before the train was widely used for transportation the only other means to get the resources to factories was by steamboat or horse. 

Include the poem for more info but this is what i know about the goddess athena athena is a greek goddess of war and sprang from zeus head full grown in a full set of battle armor.