I believe these ads are targeted to the general public to improve their image regarding some of the "negative" images created by: 1) their board proxy fight; 2) local anti-CSX attitudes such as those promoted by Lt. Gov. Murray during the negotiations for the purchase of the Framingham-Worcester portion of the B&A; and, 3) sentiments regarding railroad re-regulation that have been floating around and were inflamed over the fuel-surcharge issue. There has been no shortage of CSX-bashing...some deserved, some not.
Edit: I'd also add that the intersection of issues relating to energy, environment, infrastructure and now the economy, will make this upcoming time very active with government decision-making and policies promoting and/or regulating various transportation modes. So it's probably a good idea to build positive public awareness, as these ads do, regarding energy effiiciency, and by extension, environmental friendliness.