writes "Wired reports (http://www.wired.com/threatlevel/2012/01/railroad-memo/) that the The American Association of Railroads (http://www.aar.org/) is refuting the US Transportation Security Administration (http://www.tsa.gov/) memorandum that said hackers had disrupted railroad signals. In fact, "There was no targeted computer-based attack on a railroad", said AAR spokesman Holly Arthur. "The memo on which the story was based has numerous inaccuracies."
The TSA memo was subject of an earlier slashdot story (http://tech.slashdot.org/story/12/01/24/0054207/hackers-manipulated-railway-computers-tsa-memo-says) in which slashdot user currently_awake accurately commented on the true nature of the incident (http://tech.slashdot.org/comments.pl?sid=2635223&cid=38800761)."Link to Original Source