Train event on october 1 - 11.
https://3d.nicovideo.jp/search?perfect_match=1&word_type=tag&word=%E3%81%8D%E3%81%8B%E3%82%93%E3%81%97%E3%82%83%E3%83%88%E3%83%BC%E3%83%9E%E3%82%B9

pick a train and stretch your avatars face across the front and some choochoo.oggs and you are good to go.