JR EAST Train Simulator is a single-player railway simulation. Its announced Musashino Line and Keiyō Line DLC covers a 101.3 km section from Tōkyō or Minami-Funabashi to Fuchūhommachi, featuring E231-0 Series trains and, with the required additional content, the 209-500 Series.
The route is distinguished by multiple tunnels and no level crossings in its passenger operating section. It links the Tōkyō, Saitama, and Chiba areas, with services connecting to places including Tōkyō, Kaihin-Makuhari, Ōmiya, and Hachiōji. The DLC’s release was announced for October 27, 2026, JST.