Amtrak dramatically changed its policies on unaccompanied minors, Lenore Skenazy talked about it in an editorial (and on FRK), and she got a reply back that reads, basically:
"I went on a train once, and OMG it was a train! People get on and off! So it's totally not safe for kids, and I don't know why on earth terrorists haven't attacked Amtrak yet."
Of course, the unaccompanied minor program on Amtrak appears to be different from similar programs on planes - sounds like they really are unaccompanied, not "accompanied by an employee".
"I went on a train once, and OMG it was a train! People get on and off! So it's totally not safe for kids, and I don't know why on earth terrorists haven't attacked Amtrak yet."
Of course, the unaccompanied minor program on Amtrak appears to be different from similar programs on planes - sounds like they really are unaccompanied, not "accompanied by an employee".