Takara Tomy will release Mugen Train parts from Demon Slayer as collectible capsule toys in its Capsule Plastic Trains: Special Spin-off Edition line. There is no concrete release date, with the website stating that they will become available from December 2021. It will cost 300 JPY to play. [Thanks, Hobby Watch!]
In total, there are five parts for you to collect. They are: the front car, the tender, two passenger cars, and a car that Enmu took over. Each car is about 4.5 centimeters in size. Since this is a capsule toy machine, there is no guarantee what you will get. But it does give you the freedom to construct your own Mugen Train, with any number of cars in any order.
Each car (aside from the front) will come with little character plates as well. The pairings for the plates are: Akaza and Rengoku, Tanjiro and Zenitsu, and Inosuke and Nezuko. Interestingly, in the actual anime and manga, Tanjiro spent more time with Inosuke, whereas Zenitsu and Nezuko protected the passengers together off-screen. The car Enmu took over will only come with Enmu.
Though the anime started the Entertainment District Arc, merchandise for Mugen Train Arc is still coming out. For example, Good Smile Company will release a total of four figures from Rengoku and Akaza’s fight at the end of the arc. Prior Demon Slayer merchandise from Takara Tomy includes a Game of Life board game and a Nezuko-themed sewing machine for kids.
The Takara Tomy Demon Slayer Mugen Train capsule toys will appear in Japan in December 2021.