Not the first such accident - US rail is has a much worse record that British, for which we should be thankful. It brings to mind, though Llangennech.
President Obama brought in regulations for the transportation of toxic substances on US Railroads, during his time in office President Trump revoked the regulations.
Trump administration repealed a regulation requiring modern brakes for oil trains and cancelled a plan requiring train operators to be tested for sleep apnoea, withdraw a requirement for two-person crews on trains.
The USA FRA in Trump's time spelt out the broader department attitude toward rail safety:
“DOT’s approach to achieving safety improvements begins with a focus on removing unnecessary barriers and issuing voluntary guidance, rather than regulations that could stifle innovation.”
Derailments and level crossing accidents seem, to me, in the USA just a day to day hazard of running a railway