A note of interest: at 9:44 in the video just before entering the south end of the Kanmon Tunnel, note the unusual overhead wiring. That is actually the _dead section_ of no overhead power that separates the 20,000 V/60 Hz AC overhead power used by JR Kyushu and the 1,500 V DC overhead power used by JR West. This is why the train set is a 415 Series model, one that can run on either type of overhead power.