"Safer" tank cars...not unlike the 'Safer" ocean-going tankers, I suppose (single hull vs double hull) but if the tanker (ocean-going) is registered in Liberia as the vast majority are, there are no regulations mandating double-hull tankers. And, without those regulations or enforcement thereof, massive oil spills will continue along with the resulting environmental destruction/devastation on the oceans/seas and on land as demonstrated by ongoing derailment events. Clean up is just enough to make things appear to be back to normal and the offenders spend millions on their PR BS to assuage the public (whom they consider to be either ignorant or unconcerned). Out of sight, out of mind as the adage goes.
Make the tankers (train) "safe" without maintaining the tracks they run on or checking regularly for their integrity/safety is absurd. Not unlike putting more planes in the air and not maintaining the runways or upgrading and sufficiently manning the towers (Air Traffic). Oh, almost forgot, how about the maintenance/safety of all the bridges the oil trains cross.
Oh well, as long as the greedy reprobates in the extraction industry (oil, gas, coal, minerals) and their contractors (private railroads, trucking firms, pipeline owners, refineries, etc.) run the show with their treasure troves of cash and their penchant for shoring up their bottom lines, boosting profits, and paying dividends no matter the cost to all life and the environment, NOTHING WILL CHANGE...it will continue BAU.