I would not be surprised if regulators force dust mitigation onto the industry. It might be accomplished by spraying the load with an anti-dust coating, or covering it.
It's actually not just the big,bad G driving the issue..in the Powder River Basin the BNSF/UP consortium has had some huge maintenance headaches over coal dust contaminating the ballast..
There was at least one in-depth article in "TRAINS" in the last 2-3 years. IIRC, the railroads were proposing passing the added maintenance costs on to the mine operators (who, O.C would pass them onto the utilities buying the coal).
I believe the upshot was that some of the mines started spraying the top of loaded gons with a substance that makes the dust "stick" better to the load..
Anyone know more about this?