As david sirota put it, this disaster is a bipartisan effort in avoiding safety regulation. Obama the neoliberial listened to the chemical lobby and not the National Transport Safety Board for the safe transport of hazaardous chemicals.
As a result class 2 hazardous chemicals (highly flammable ) were removed from the requirement of electronic braking systems on the neoliberal fake news premise that best regulation is self regulation. That was obamas doing.
What trump did was repeal these limited regs that only applied for oil cargo. Both the dems and repubs have skin in this game.
Vinyl chloride is in the class 2 category and biden has yet to fix this or made any indications that he will. In fact when rail workers tried to strike warning the public of falling safety stds and lack of maintenance biden signs the bill to stop strike going ahead cutting workers off at the knees.
See Sirota’s interview here at 11.06 minute mark
See bidens bill here