If you're on an Amtrak train at your destination, and you realize that the TSA is "forcing" all arriving passengers to be screened for weapons, contraband, valuables they can steal, and breasts on attractive women...

What would happen if you approached a crewmember on board the train, explained your refusal to put up with that, and asked if you could "extend" your ticket to the next station with a Greyhound station?

A quick check with the Amtrak timetable reveals what you'd have to do:

Southbound on the Silver Star: go to Jacksonville for an extra 2:26
Southbound on the Silver Meteor: go to Jacksonville for an extra 2:39
Southbound on the Palmetto: end of line; you're screwed

Northbound on the Silver Star: go to Columbia for an extra 2:44
Northbound on the Silver Meteor: go to Charleston for an extra 1:51