Having ridden once on AMTRAK, I’d tend to say if your whole aim in life was to target and attack blacks while on a AMTRAK train...you probably won’t find more than three-percent of the passengers being non-white.
You’d be better off showing up at the Memphis Greyhound Bus Terminal, or stopping at some gas station just off the interstate there in Birmingham, Alabama.
Either this guy is a total nutcase, or the FBI is really reaching to find adequate charges to make up.