Unlike most train simulators made by gaming companies, the was originally an internal professional tool used to train real train drivers. The "story" here is that JR East took its proprietary, high-precision professional driving simulator and released a consumer version on Steam (PC). Build 11779437 is one of the many updates or patches to that consumer version.
If you are looking for an arcade experience where you can drive a train while looking at your phone, . It is ruthless. Every yard marker, every whistle post, and every speed sign matters. JR EAST Train Simulator Build 11779437