Courtesy of Cliff Mass' weather blog, here is a University of Washington professor of Atmospherics Science, Don Jaffe, who wants to do a study of impacts from trains on our air.  However, because of politics, no public funding is coming forth.  So Don has turned to crowd funding.  Check it out at the Microryza site for Don Jaffee and consider contributing.  Even $10 will help toward the goal of $18,000.  They have $3,000 as of this writing.