The nation’s largest freight rail carrier failed to fix and continued to use faulty equipment, according to the Federal Railroad Administration. Managers reportedly pressured inspectors to leave the yard so they could keep freight moving.
A company that large can't be meaningfully regulated, as we saw during the recent labor disputes. They do as they please and any fine they incur is less than what they make by breaking the law.
It's also something that can be cured by a strong union negotiating for safer conditions. It's a good idea to stop rail unions from striking for some reason though....