http://www.chicagotribune.com/news/local/ct-met-old-post-office-pollution-0206-20120206,0,1354245.story
It appears that Amtrak plans on replacing all of its locomotives with cleaner equipment in 2015. This, of course, depends on federal funding, which has been targeted for congressional budget cuts, so don't hold your breath...unless you are bothered by the diesel fumes.

