Demon Slayer Mugen Train Arc will be delaying the 4th Episode due to election coverage.

The Official Demon Slayer Twitter account and website have confirmed today 10/19/2021, that the Demon

Slayer: Kimetsu no Yaiba Mugen Train Arc (Kimetsu no Yaiba: Mugen Ressha-Hen) will be aired on November 7th rather than the initial October 31st date .

The show will be delayed by one week due to election coverage for the Japanese House of Representatives.

The arc is scheduled to conclude by November 28th with the Entertainment Arc following close behind on December 5th with a one-hour special. I don't anticipate this changing in the near future unless further delays occur.

Both Funimation and Crunchyroll are currently streaming Demon Slayer: Kimetsu no Yaiba Mugen Train Arc and Demon Slayer: Kimetsu no Yaiba Entertainment District Arc.

Source: Demon Slayer on Twitter