December 7, 2017 - The U.S. Department of Transportation on December 4 announced that it will withdraw a 2015 regulation requiring the use of electronically controlled pneumatic (ECP) brakes on certain trains carrying flammable liquids, on the grounds that the safety benefits were inconclusive...
www.enotrans.org
From what I got from this article, it sounds like the railroads had issues with the rule. They wanted a review from a group of government entities and then it was reversed in 2017. It also looked like the rule that was in place prior was only there since 2015.
Maybe I am oblivious, but I don’t remember many train derailment coverage prior to 2015, or 2015-2017, or from 2017 through 2021. In fact, I think the only major one in the United States I can remember is East Palestine simply due to the aftermath. I do remember a passenger train derailment over in Europe I believe. I don’t remember which country, but it was probably 5-10 years ago.
KEY: R = revised. a Excludes highway-rail grade crossing accidents. b In 2002, 1,441 injures were due to a single derailment in North Dakota involving hazardous materials.
www.bts.gov
This site shows that train derailments have been roughly the same number per year since 2009 (range from 1600-2100 derailments per year)