You can carry them, no problem. As said above, properly bag and store any that are in suitcases, ect. I stealth vaped in the restroom, and in the little roomette the wife and I had. Just don't blow clouds. Don't know if their smoke dectors would pick it up or not. I just blew down under my shirt or covered my mouth with a blanket I had. If you decide to, or need to vape, just be aware, if you are caught, they won't think twice about putting you off the train at the next available stop.