tl;dr: Running Train, an Early Access train sim built by solo developer Novatetsu Games, recreates a fictional Japanese region with 42 routes across 40km of meticulously detailed track—including logically placed powerlines, traffic, and weather/seasonal effects—much of which isn't even visible from the driver's cab. Steam reviews are overwhelmingly positive, praising the modeling, lighting, and support for the Zuiki MASCON peripheral. Planned additions include passengers, a conductor mode, and expansion to 100km of track by end of next year. It's available now for $18.