In terms of the DOT-111 specifically, since 1991 we've known they're not safe for the transportation of dangerous goods, and yet we've continued to use them for the transportation of dangerous goods.
When the Mississauga train derailment happened in 1979, the reaction from the regulator was to lower the speed to 15 miles per hour, until it was determined that it was safe, in other words, until there were enough inspection points along the route to give a reasonable assumption that it was safe. The transportation of dangerous goods in DOT-111s is now widely known not to be safe. Since we cannot stop them, can we at least slow them down? Is there a possibility that a 15 miles per hour regulation could be placed on DOT-111s through densely populated areas?