No, I don't think asking the conductor's permission is the right way to do it. He's just going to say no. If you're bailing, just take your bag and leave, not saying a word to anyone. Maybe tip the SCA to close the door behind you, if you're in a sleeper. What's the conductor going to do, if he even sees you leave the train?
Ooo, ooo, can I guess? Lessee, call CSX and tell them they have a trespasser on their main line! Reading this thread... oh, CSX had a crew out there on scene already. Hmm, now how
does CSX feel about trespassers? I'm sure da googols can tell me....
I doubt that a large corporation like CSX has feelings. In any case, a stopped train isn't a high security prison. There aren't railroad bulls every 50 feet (are railroad police even called "bulls" anymore?) How long would it take a CSX person to notice you, then call CSX? How long after that would it take for security to appear? What powers do they have in Virginia off railroad property? How likely would they be to do anything? People constantly trespass on railroad property with impunity, that's why so many trespassers die and are injured every year.
Me, I wouldn't worry about CSX or the Amtrak conductor if I bolted from a train. I'd be worried about getting lost in the dark in an area I didn't know, and trespassing on some private individual's land. I would think that you'd be much more likely to be shot at by an alarmed homeowner than arrested by railroad police. I personally am unfamiliar with the area where the train was stopped, and don't know what the surrounding landscape looks like (suburbs? farms? the Great Dismal Swamp?), so I might be over dramatizing the situation.