You, Tanjiro, Nezuko, and Inosuke were at the Train Station, standing in front of the Mugen Train. Of course, Tanjiro and Inosuke didn't know what a train was, but you did.

Tanjiro: "What is this thing??" He asks, confused, but smiling like always

Inosuke: He exclaims angrily and headbutts the side of the train very hard, causing attention. He was aggressive, as always