The Transportation Secretary is specifically listed as in charge of Rail Infrastructure and implementing regulations regarding interstate trasnport. This is why he was also responsible to work with the union to avoid the strikes... and because it is part of national policy the President was able to simply declare it illegal for them to strike.
Anyway, yes. Buttigieg is responsible for exactly this kind of thing. Including the issues from wreckage. He should be there working with the EPA to resolve issues. Not ignoring them and trying to pass the buck. Shoot even Brandon is passing the buck on this one, or trying to. (Just FYI, Brandon. The Buck stops at your desk, you can't keep trying to place it on Trump's. Hire someone that can do the job, with actual experience and capabilities, not just because they fit "diversity standards"...)
Biden offered help.