Another revolution that took place was the increasing use of bigger ships. Over a period from 1945 to 1995, oil tankers increased by the size of almost twenty times while dry bulk vessels became almost some fifteen times bigger. This increase in ship sizes led to a great reduction of shipping costs that industries increasingly preferred using ships than to the old railroad methods. The reduction in cost was of great advantage to industries to carry around their raw materials (e.g. this led to the cost of transporting coal by sea from Virginia to Jacksonville, Florida almost three times cheaper than by rail) (Chrzanowski, 1985).