Here is a video of a guy 'trainsurfing' which is to say he jumps on the back of a bullet train and holds on for dear life until the next train stop. It looks like he attaches some kind of suction device to the back window of the train which has a cable attached to it that he holds onto. According to the caption for the video these bullet trains can reach up to 300 km/h or 186 miles an hour. There are quite a few train surfing videos on YouTube. Apparently the guy in the video died of leukemia in 2006. Hint: Don't try this at home.