Based on your choices of methods, for reliability, yes I believe jumping seems to be the most effective one, however, you must make sure that you land on your head and fall at a sufficient height. It is possible to fail and end up a vegetable or in a lot of pain (or both). Train may work too (if you don't mind traumatizing the conductor and inconveniencing the passengers on board), but may also fail too. Hanging is reliable if you tie it correctly, have the right quality of rope and structure to hold your weight as well as serious resolve to see it through. Also, a failed hanging can result in permanent damage (vegetable) due to damage to the brain and neck. SN I can't comment, but I think @YellowJasmine covered it pretty well.