One of the most argued points of Trainz lore is the physics debate. Unlike its rival, Trainz never pretended to be a perfect Newtonian simulator. Instead, it operates on what fans call "Rule of Cool Physics."
In 2009, the prominent "UK Branch Lines" (UKBL) team removed their Thomas models, paving the way for the "Sodor Island 3D" (SI3D) era. The TF2 Connection: A deleted Team Fortress 2 trainz lore and facts
As of this article, the latest iteration is (TRS25). The current lore revolves around "Trainz Living Railroad" —a system where AI drivers have their own schedules, memories, and even "personalities." Lore Fact: There is a persistent rumor that if you let an AI driver run a route for 100 in-game years (using fast-forward), the driver will eventually "retire" and refuse to operate, displaying a text message: "Engineer is tired. Going home." One of the most argued points of Trainz
Even after 23 years, some Trainz mysteries remain unsolved. The TF2 Connection: A deleted Team Fortress 2