I just came back from a trip to Southern California on Amtrak. I had a backpacking stove and Snow Peak (isobutane) fuel canister in my backpack, which I took as carry-on baggage. They didn't inspect anyone's baggage or even ask what was inside, so I imagine you wouldn't have a problem so long as your fuel container is leakproof and can withstand pressure changes due to elevation. I also packed a knife and trekking poles.