Percent by Rail

What are the three type of industries that ship the highest percent of their product by rail?

My guesses would be coal, steel, and lumber, respectively.

How about Mining, chemical, and automobile? Just a guess. In all three cases road and air are impractical.

But Mark, based on your own figures above, on an absolute basis, not percentage, coal is the winner reagrading gross tons.

YES

What about the Standard Industrial Classification?
http://www.osha.gov/pls/imis/sic_manual.html
http://www.osha.gov/pls/imis/sicsearch.html
http://www.osha.gov/pls/imis/sicsearch.html?p_sic=&p_search=Petroleum
http://www.osha.gov/pls/imis/sicsearch.html?p_sic=&p_search=coal