This is Plarail Demon Slayer Mugen Train Set.
With 5 plastic kids: Kamado Tanjiro, Kamado Nezuko, Zenitsu Agatsuma, Inosuke Hashibira, Purgatory Anjuro
It is possible to stand plastic kids on the roof of the passenger car
You can play by rolling by turning off the 1-speed switch.
Rails are sold separately.
Plarail Demon Slayer Mugen Train (1 set)