Well, I understand the futility of trying to talk to a half-assed half-wit like you, but I will try once more to dumb it down to your level as best I can.
1) Obama created an effective safety regulation requiring electronically controlled brakes on trains that carry highly flammable and hazardous liquids.
2) The Reuthuglickers in Congress created a law in 2015 called the FAST Act. It did not effect Obama's train regulation at the time because it only pertained to NEW regulations put in place AFTER the 2015 FAST Act was in place.
Are you following me dumbass, or do you need to go back and re-read it a dozen or two times?
Take your time. I realize how slow you are.
Are you ready to continue?
Okay, here we go...
3) After Trump repealed Obama's regulation, any NEW regulations that Biden or any future President might try to implement DOWN THE ROAD, would have to conform to provisions in the FAST Act, which require new regulations to be "cost effective" (not lower their enormous profits).
Get it, no-nuts?
To summarize:
Obama put regulations in place that would have prevented the Ohio derailment.
The Rethuglickers passed a law, that would make any NEW --> FUTURE regulations have to be profitable for the train industry.
Trump did away with Obama's protective regulation.
It would be an almost impossible task for Biden to put NEW regulations in place, thanks to the Ratpublican's FAST Act
That's as simple as I can make it for you, Jethro.
If you're too fucking stupid to absorb it through your thick, concrete skull, which I'm sure you are, then there's nothing else I can do for you.
You've already taken up more of my attention than a loser like you rates.